Mixer
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Startup is a headphone amp, six-input mixer, tap tempo clock, divider & multiplier in 4hp. It's the perfect way to start a small Eurorack case. Full DIY Kit.Startup is designed to be the best way to start a small Eurorack case, featuring a Mixer, Clock & Headphone Amp. This is a really easy project for DIY newcomers, all the SMD components come pre-soldered and the PCB is programmed and testing prior to shipping. You just need to solder the buttons, jacks and pot. The Music Thing Modular ‘Startup’ is designed to be the best way to help start a small Eurorack case.This 4HP module does three things:1) It’s a 5 channel output mixer, with a spare channel for stereo signals (like a Korg Volca or a phone).2) It’s a nice clean headphone amp with two outputs.3) It’s a useful tap-tempo clock, with a second channel giving divided or multiplied clocks.The best way to understand Startup is with with the Quick Start Manual. (Use button below)DIY-Kit-Type:SMD-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. All SMD parts are pre-soldered, only trough-hole parts to solder. For build guide, more info, videos etc. please check the buttons below.
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• Vactrol Mix combines four audio or CV signals into two channels, determined by the random sequence. It’s a great way to create stereo effects, complex waveforms or feedback loops.• This expander is 4 in, 2 out vactrol matrix mixer controlled by the Turing Machine, connected around the back by a 16 pin ribbon cable.• There are four inputs, for audio or CV sources. The four knobs set the level for each input. Next to each knob is a pair of LEDs. When the LED on the left is lit, the signal goes to the left output. When the LED on the right is lit, the signal goes to the right output. The LEDs are controlled by the Turing Machine module. The two outputs are both doubled (mult-ed) to make it easier to patch feedback loops.• Despite being less popular or widespread than Pulses or Volts, this is my favourite Turing Machine expander. It is a unique device that turns mundane source material into wild, unpredictable but rhythmically accessible patterns of sound. It’s a great way to create stereo effects, shifting drones, complex waveforms or feedback loops, and can be the heart of small (but chaotic) system.• Vactrols are electro-optical devices; a light shining on a light-dependent resistor. They have an extraordinary history, from powering the optical soundtracks on the first sound films in the 1920s to studio compressors, the tremolo in Fender guitar amps, and many of Don Buchla's 1970s synth designs. Modern vactrols are an LED pointing at a cadmium light dependent resistor, sealed together in a little black plastic box. Because the LDR reacts relatively slowly, the signals cut together smoothly, with no clicks or pops. Unfortunately, the cadmium in light dependent resistors is banned in Europe, so Vactrols are becoming harder to find.• Feedback is where this module gets really interesting. Try sending the (bottom) left and right outputs to your output mixer, and the (top) left and right outputs to spring reverbs or delays, patching the delay/reverb outputs back into input channels. Carefully ride the input levels, and you'll get snippets of feedback. The main clock speed can have a huge effect on feedback levels, because it takes a while to build up.• There are lots of Vactrol Mix audio examples in my Soundcloud: Twenty Minutes of Madness, Contact Mic Feedback and this ancient track recorded using the breadboard prototype.• The Vactrol Mix is DC coupled, so you can also rhythmically cut up DC sources; mix LFOs at different speeds with audio rate oscilllators, and frequency modulating a pair of oscillators using the two outputs.• This module was inspired by Grant Richter's Cadavre Exquis voltage controlled mixer, which was inspired by André Breton's surrealist game Exquisite Corpse. Richter's mixer also inspired the RxMx module by Make Noise.• Jonathan Higgins, on Facebook: 'There isn't a patch I don't use it on. People often thing you can only use it for crazy stereo percussion (which it is amazing at). But I also often patch all four outputs from the humpback filter into it for evolving stereo drones.'• The Vactrol Mix is a very straightforward through-hole DIY build. If you get stuck, the Github Issue List is probably the best place to start - remember to check closed issues as well as open ones.DIY-Kit-Type:THT-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. Only trough-hole parts to solder. Make sure to check the build guide before you buy. For build guide, more info, videos etc. please check the buttons below.
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The Workshop System is a complete modular synthesizer and audio computer – small enough to fit in a book-sized case, but packed with sound-shaping tools and educational potential. Designed for musicians, makers and tinkerers, it’s a fully modular playground for learning, composing, experimenting, and hacking.The system includes 14 analog and digital modules, ranging from vintage-style oscillators and filters to a programmable digital Computer module with swappable program cards. It works standalone inside its custom case or can be mounted in a Eurorack system (42 HP).You can use the system for crafting pure tones, exploring feedback loops, integrating guitar pedals, or writing your own firmware – the Workshop System invites hands-on discovery and creative exploration.Features:• Complete modular synth in a compact, case-mounted 42HP format• Includes 14 modules: oscillators, filters, mixer, ring mod, stompbox loop, envelope generators, and more• Powerful Computer module with RP2040 brain and reprogrammable program cards• Runs on USB-C (Power Delivery!) power (15 V) or standard Eurorack barrel input (15-25 V DC)• Works with audio sources, guitar pedals, microphones, and external MIDI/CV gear• Designed for experimentation, hacking, education – and serious music making The kit does not include:• Eurorack patch cables – we figure that many users of modular synths already have patch cables lying around – but if you’re just starting out and would like a set of short patch cables then we have a cable set available HERE• A power cable – The Workshop System has two power options: The easiest way is via USB-C PD power, but you can also use a regular 15-25 V DC barrel connection like THIS. The system will happily run from battery powerbanks and laptop adaptors. We feel that there are already enough USB-C cables in the world.DIY-Kit-Type:SMD-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. All SMD parts are pre-soldered, only trough-hole parts to solder. For build guide, more info, videos etc. please check the buttons below.
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North Coast makes the Eurorack four-knob utility mixer sound great again with this minimalist design featuring just six transistors. Where a conventional mixer would typically require at least five operational amplifier units each containing a dozen or more transistors, we cut the complexity and distill mixing to its essence. This is a new design made with current components and modern manufacturing quality; but its Class A amplifiers operate on principles that go all the way to the dawn of electronic signal processing.Suitable for both audio and control voltages, with bonus features that don't compromise the minimalist philosophy: positive and negative offset; simultaneous DC- and AC-coupled outputs; maximum gain a little over unity for when you need that extra push over the cliff. It can also function as a transistor distortion effect, by offsetting the signal until it clips and then using the AC-coupled output.Features:• High-quality potentiometers with bushings fastened to the panel for wobble-free operation; conductive plastic for smooth feel• All-new design, not a clone or imitation of anything else• Classic discrete-transistor design style; DIY kit ships with silicon 2N5088 transistors for a clean modern sound, easily modifiable to use other recent or "vintage" types• No ICs!• Through-hole for easy hand construction and maintenance• No compromises on build quality: real aluminum panel, not PCB material, with colour printing; nickel and gold plating on the circuit board; film output coupling capacitor; close-tolerance metal film fixed resistors.• Fully open design - no lock-inDIY-Kit-Type:THT-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. Only trough-hole parts to solder. Make sure to check the build guide before you buy. For build guide, more info, videos etc. please check the buttons below.
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The Petit Mix is a 3HP Eurorack mixer module with 4 inputs. Each input has its own level control and all inputs are DC coupled to allow for CV mixing as well as audio. There is a bi-colour led on the Frontpanel to indicate signal polarity for active channels. DC coupled, 4 Inputs, Low Noise, Bi-Color LED showing positive (green) and negative (red) voltages.DIY-Kit-Type:SMD-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. All SMD parts are pre-soldered, only trough-hole parts to solder. For build guide, more info, videos etc. please check the buttons below.
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Petit Mix is a compact 4-channel Eurorack mixer. The mixer delivers transparent sound and instant hands-on control in just 4HP. Built for clarity and workflow speed, Petit Mix features four top-to-bottom channel strips (input jack above fader) and a summed mix output. Smooth, linear-response faders make precise level adjustments simple. If you want to balance your audio sources, blending CV signals or shaping a live mix. Low-profile and designed for fast operation, Petit Mix is the go-to small-format mixer that keeps your patch clean and lets you focus on the sound.Features:• Four independent input channels with dedicated smooth faders for precise level control.• Summed mix output for clean stereo or mono routing.• Top-to-bottom channel layout (input jack above fader) for intuitive, fast workflow.• Linear-response faders suitable for both audio and CV mixing.• Ultra-compact 4HP footprint saves case space in crowded rigs.• Low-noise design preserves dynamics and clarity across sources.• Fast-access layout ideal for live performance and hands-on patching.DIY-Kit-Type:SMD-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. All SMD parts are pre-soldered, only trough-hole parts to solder. For build guide, more info, videos etc. please check the buttons below.
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ST MIXER XL is effectively an eight channel stereo mixer with a really good sounding headphone amplifier built in. It is designed to be the final output module of a larger system that you want to use with headphones and simultaneous recording via 1/8 inch stereo jack cable to a portable recorder.The module consists of four mono channels with level, panning and aux send control, and two stereo channel with level control and separate inputs for left and right. The stereo PHONES and LINE OUT outputs also have level control. The AUX output is a mix of the aux sends from the four mono channels. The OUT 1 is a buffered direct out from channel one, to feed to a looper for instance.ST MIXER XL is perfect for a larger system with up to four mono synth voices and a stereo effect. The headphone output can drive most headphones quite well and the line output is perfect for recording with a portable recorder or an audio interface.DIY-Kit-Type:SMD-Kit-2. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. It includes SMD and through-hole parts! For build guide, more info, videos etc. please check the buttons below.
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Panning Stereo Mixer. ST MIXER is effectively a five channel stereo mixer with a really good sounding headphone amplifier built in. It is designed to be the final output module of a small portable system that you want to use with headphones or for recording via 1/8 inch stereo jack cable to a portable recorder.The module consists of three mono channels with level and panning control and one stereo channel with level control and separate inputs for left and right. The stereo headphone output also has level control.ST MIXER is perfect for a starter system with a couple of synth voices and a stereo effect. The headphone output can drive most headphones quite well and also doubles as a recording output to connect to for instance a Zoom recorder.Headphone output power: 6,4 mW @ 73 ohmsDIY-Kit-Type:THT-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. Only trough-hole parts to solder. Make sure to check the build guide before you buy. For build guide, more info, videos etc. please check the buttons below.
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Aeolus Mixer is a 6HP quadraphonic unity mixer. Three quadraphonic inputs and two stereo outputs are mixed to provide a quadraphonic output with 5.1 compatibility.Features:• Quadraphonic unity mixer• 3 quadraphonic inputs with mono and stereo normalisation• 2 stereo inputs with mono normalisation• Cross switch on the second stereo input allowing stereo crossing in the quadraphonic space• 5.1 compatible outputs thanks to the center and sum output in addition to the four main outputs• Jumpers on the back on the module for gain reductionDIY-Kit-Type:SMD-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. All SMD parts are pre-soldered, only trough-hole parts to solder. For build guide, more info, videos etc. please check the buttons below.
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A Genuine Wave Craftsman! The Jeweler Cast melts, bends, and chisels all types of signals, audio, or CV. Composed of two independent sections, the Mix, and the Shaper, the Jeweler Cast combines a ring modulator, a crossfader, a wavefolder and a distortion. Thanks to its tool ensemble, this fully analog yet compact module can manipulate basic waveforms and complex signals in infinite ways.Features:• Mix section crossfading between three sources including a ring modulator• Shape section acting as a wavefolder or a heavy distorsion• Bypass (dry signal) of the shape section at minimum setting• Processing audio or CV signals• AC coupling switchDIY-Kit-Type:SMD-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. All SMD parts are pre-soldered, only trough-hole parts to solder. For build guide, more info, videos etc. please check the buttons below.
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The Threetom Modular “Mixing Flask” is a utility mixer offering mix-bus limiting and a cornucopia of indicator lights integrated behind a unique chemical lab-inspired front panel.I designed Mixing Flask as a solution to my main three gripes with conventional utility mixers:• Mixing too hot is too easy, leading to hard clipping on the mix-bus. And even when there’s an indicator light to warn you when this is happening, there are no features to actively prevent it.• Utility mixers usually only offer unity gain, so when you have a weak input signal (like a MTM Radio Music), you’re out of luck• They’re nauseatingly boringMIXING FLASK provides solutions to these annoyances in the following ways:• I’ve implemented a soft-clipping limiting circuit on the mix-bus (inspired by DOPPIO). The highest setting prevents the mix-bus from hard clipping altogether in favor of warm saturation.• All inputs have a gain of +6dB allowing you to better equalize between volumes while maintaining a hot mix-bus output• The myriad of indicator lights and front-panel graphics make you feel like a mad scientist in your modular chemical lab. I bet you won’t find another utility mixer that makes mixing more exciting than Mixing Flask!Use cases:• Mix oscillator waveforms without the risk of hard-clipping• Mix CV signals while keeping an eye on what’s coming in and going out• Give a gentle boost to weak input signals (e.g. from a sampler module)• Have a utility mixer in your case that’s interesting to look at, and doesn’t bore you to death!Features:• Three different flavors of saturation on the mix output (hard clipping, soft/hard clipping, or soft-limiting)• Three inputs with up to +6dB of gain, and bipolar monitor lights• One mix output with three-stage bipolar monitor lights (signal present, signal nominal, hard-clipping warning)• Backlit chemical-lab-inspired front-panel graphicsDIY-Kit-Type:SMD-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. All SMD parts are pre-soldered, only trough-hole parts to solder. For build guide, more info, videos etc. please check the buttons below.
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Sonveskan is a three-channel mixer built from discrete components and germanium transistors, engineered to deliver gritty, analogue warmth and aggressive harmonic colour. Each channel features two serial gain stages (a front-panel drive control plus a PCB trim), voltage-controllable feedback with a dedicated feedback pot and CV input, a mute switch and a direct output. The main channel adds a two-band equaliser and an additional gain stage with its own trim for extra edge and saturation.Patching multiple strips together encourages wild feedback, multi-stage distortion and experimental textures, making Sonveskañ a compact but powerful tool.Features:• Three identical channel strips with dual serial gain stages.• Voltage-controlled feedback per channel with CV input and feedback intensity control.• Mute switches and direct outputs on each channel for flexible routing.• Main channel two-band EQ plus extra gain stage for added grit.• 2017 model fitted with larger coupling capacitors for improved bass response.• Built around germanium transistors and discrete circuitry for vintage, lo-fi character.DIY-Kit-Type:SMD-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. All SMD parts are pre-soldered, only trough-hole parts to solder. For build guide, more info, videos etc. please check the buttons below.
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The 2M is a dual three channel mixer in 6 HP with volume controls over all the inputs as well as the final output. As its design has been specially focused on audio applications, the input potentiometers are audio-taper type while the output ones are linear. Low distortion / high quality audio operational amplifiers have been selected in order to achieve clean audio mixing, but is also DC-coupled, so it can perform CV signal mixing as well. Great for a small system, allowing for submixes or even stereo mixing.DIY-Kit-Type:THT-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. Only trough-hole parts to solder. Make sure to check the build guide before you buy. For build guide, more info, videos etc. please check the buttons below.
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High-Class Linear VCA & MixerIf you have been already into the Eurorack world for a while, I’m sure you have heard the sentence: “you never have enough VCAs” more than once.As an electronic musician, this has always been present. I can’t count how many times I needed an extra VCA with all of them already being used.I wanted to create an all-around, good-sounding, and handy VCA, small enough to fit on little systems but with a good amount of channels and functionality. And this is what Ceres is.Its core, the 3360, has been used for years in dozens of devices with remarkable performance. Sum it to a carefully designed 4-layer PCB layout, and we get a super quiet VCA in terms of noise and CV bleeding.The combination of daisy-chained inputs and mixed outputs achieves a vast range of possibilities. Several CV signals can modulate a unique source with every output mixed back at the final stage to create new waveforms and open the door to experimentation.Features:• Six channels• Low noise analog VCA circuits• Precise Linear response• Quiet signal path• Daisy-chained audio inputs• Mixing stage on channel 6• Unity gain CV level: 5V• Input Impedance: 100kΩ• Output Impedance 1kΩDIY-Kit-Type:SMD-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. All SMD parts are pre-soldered, only trough-hole parts to solder. For build guide, more info, videos etc. please check the buttons below.
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Hive is a four-channel stereo mixer offering per-channel CV-controlled panning with the trademark Vostok twists that turn a straightforward mixer into a versatile toolbox for any rack. Each channel includes a boost stage to match levels between modules and to accommodate pro-line devices like desktop synths or drum machines, so signals sit correctly in the mix without extra attenuation or padding.Panning uses a custom law with −1.5 dB attenuation at center, delivering smooth, musically balanced transitions whether adjusted by hand or driven by CV. Rear-panel chaining connectors let multiple Hive units act as channel expanders or submix stages, enabling larger mixes and flexible routing topologies.Housed in just 10 HP, Hive combines compact footprint with practical features for stereo mangling, FX sub-mixing, end-of-line mixing and more, making it a handy utility for both performance and studio patching.Features:• Four-channel stereo mixer with per-channel CV-controlled panning.• Per-channel boost stage for level matching and pro-line device compatibility (desktop synths, drum machines).• Custom panning law with −1.5 dB center attenuation for smooth, musical balance transitions.• Manual or CV control of pan for dynamic stereo movement.• Rear-panel chaining connectors to use additional Hive modules as channel expanders or submixes.• Compact 10 HP footprint that saves space in crowded cases.• Clean summing and routing suited to stereo mangling, FX sub-mixing, or end-of-line mixing.• Robust build and layout focused on fast, hands-on workflow in live and studio setups.DIY-Kit-Type:SMD-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. All SMD parts are pre-soldered, only trough-hole parts to solder. For build guide, more info, videos etc. please check the buttons below.
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Trace is a four-channel Interpolating Scanner created in collaboration with Ben Wilson “DivKid”.Introduced by Jurgen Haible in 1994 and later improved by Donald Tillman in 1999, the Interpolating Scanning circuit is a hybrid between a signal selector and a crossfader.The circuit morphs between the inputs, fading from one to the next as the voltage control rises. The Trace version of this classic circuit comes with a custom, fine-tuned slope response that prioritizes a smooth transition between the inputs, providing interesting middle points between the channels and improving its behavior when controlled by external CV signals.Following Ben’s unique vision and module design, Trace unifies the compact form that characterizes his modules with our hardware and aesthetics.From waveform morphing and CV-controlled transitions, to audio-rate scanning. Trace brings a new horizon of patching possibilities to any system.Features:• Four channels• DC-Coupled inputs for use with both audio and CV signals.• Custom fading slope designed to improve the response on middle positions.• CV-controlled scanning with onboard attenuation and inversion of the modulation signal.• Low noise analog VCA circuits.DIY-Kit-Type:SMD-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. All SMD parts are pre-soldered, only trough-hole parts to solder. For build guide, more info, videos etc. please check the buttons below.
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The Attenumixer is a 4 HP 3 channel passive attenuator and mixer module.Each channel is normalled to the sum(VI) so it can be used as a 2 channel mixer and 1 channel attenuator, or a 3 channel mixer, or as 3 separate attenuators. Normalization to the sum is broken by inserting a jack into the outs of channels I-III. The Attenumixer works well with both cv and audio, although the potentiometers have a linear response. Since the module is passive there will be signal loss at the sum out.DIY-Kit-Type:THT-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. Only trough-hole parts to solder. Make sure to check the build guide before you buy. For build guide, more info, videos etc. please check the buttons below.
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This is the panel PCB version of this kit.The Attenumixer is a 4 HP 3 channel passive attenuator and mixer module.Each channel is normalled to the sum(VI) so it can be used as a 2 channel mixer and 1 channel attenuator, or a 3 channel mixer, or as 3 separate attenuators. Normalization to the sum is broken by inserting a jack into the outs of channels I-III. The Attenumixer works well with both cv and audio, although the potentiometers have a linear response. Since the module is passive there will be signal loss at the sum out.DIY-Kit-Type:Panel/PCB Kit. This is a do-it-yourself panel/PCB kit, no parts are supplied, you will need to source them yourself.
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This is the panel PCB version of this kit.Dual summed voltage controlled amplifier and mixer in 2 HP. It is a DC coupled OTA (LM13700) Dual Linear VCA based on the same fabled design of the VnIcursal VCA. The 2 VCAs are summed together so it can be used as a voltage controlled mixer at the “SUM OUT” or all 3 outs can be used separately and simultaneously. 5 volts into the CV in will provide unity gain, anything above 5 volts can clip the input.DIY-Kit-Type:Panel/PCB Kit. This is a do-it-yourself panel/PCB kit, no parts are supplied, you will need to source them yourself.
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Dual summed mute Attenuator, Offset Generator, Mixer, and Mute in 2HPThe newest 666 version (2021) can be powered and will provide Offset of 0-5V with nothing plugged into the “IN” for each channel controlled by each respective Potentiometer. The “Sum Out” will also be able to send out 0-10v~ volts depending on the setting of each Potentiometer. Both channels are normalled to the sum, so inserting a signal into an “IN” will remove it from the “Sum Out. There will be signal loss at the sum out, because the module is passive. Great for cv or audio although the module ships with linear pots.DIY-Kit-Type:THT-Kit-1. This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. Only trough-hole parts to solder. Make sure to check the build guide before you buy. For build guide, more info, videos etc. please check the buttons below.