Quad Lo-fi Looping Sampler
Beneath the Bush of Ghosts is a 26hp Quad Lo-fi sampler based on the ISD1820 IC chip which is an old answering machine chip. This module is inspired by several other projects based on the ISD1820 chip. Each of the four channels are identical to each other with some sneaky normalisation going on between the channels for extra fun!

There is a mix output which combines all the dry inputs with the sampler outputs, while the individual outs of each channel only contain the sampler output. Each individual output is cross modulated with the channel next to it in pairs, so 1-2 modulate each other and 3-4 the same way. Each output is also normalled to the following input, 1-2-3-4 and 4 goes back to input 1. This means you can do generation loss (i.e. disintegrating loops) with some clever patching.  Each channel has a filter with lowpass to the left and high pass to the right, as well as a pitch knob with a dedicated cv input and attenuator. There is also a dedicated trig input for each channel, and control buttons for the following functions: record in, momentary play and full play of the sample. The trig inputs need a +5v gate to operate. Samples can be played on loop by engaging the ‘Loop’ switch at the top of each channel.

Recording instructions: In order to record you need to turn the loop switch off, set the pitch to around the 10 to 2 o’clock (you can experiment with this), the CV knob will usually influences the sample speed so make sure it is fully CCW. Insert an input signal (or use the looping sampler next to it) and hit record, the LED will turn off while recording, and light up again when the memory of the chip is full. It’s a simple as that!

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Current draw +12 V [mA]: no info by manufacturer
Current draw -12 V [mA]: no info by manufacturer
Current draw +5 V [mA]: no info by manufacturer
Depth [mm]: no info by manufacturer
Width [HP]: 26
Panel: Red FRP

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 please check here.
DIY level: advanced.

This module simulates the sounds of a Bunker by pushing a digital reverb tank to it’s limits, then adding in feedback and static tremolo circuits!

Bunker Archeology is a 12HP Eurorack module and the world’s first ”bunker simulator”. The module is composed by two different sections: an overdriven digital reverb “tank” as well as frequency driven tremolo/VCA. The module is normalised so the incoming signal is first sent to the reverb and then to the static (tremolo) circuit. The latter can also be used as a crude (albeit backwards) VCA. However one can easily self patch the module so the signal goes the other way around by inserting an incoming signal to the “Static in” and patching “Output” to “Bunker In”.

Using “Bunker Input” you can attenuate the incoming signal, this is helpful since the reverb tank is pushed to its very limits. Depending on how you attenuate the incoming signal (also of course depending on how “hot” the incoming signal is, digital oscillators for instance tend to be a lot hotter) the module will behave differently, not just in regards of distortion. You can regard the whole circuit as a bastardized envelope follower of sorts (that being said placing a VCA before the input is usually a fun idea, or any modulation of frequency really). When the modulation switch is switched on (ie. Downwards) it causes the reverb tank to gradually shut down (or attacking itself), shorting out the tank using a LDR and a LED. This creates interference and noise which is sent to the static circuit. It can be used for drones (shaped with the acoustics knob) or percussive sounds. The modulation knob lets you dial in the amount and character of that sound and how much of the tank that should be shorted. This knob also has CV control (expecting 0 to 5V and ignoring negative voltages).

The “Acoustics” knob lets you change the overall acoustics of the bunker which in turn effects how static behaves . Since the static circuit is frequency driven, altering the frequency changes the overall behaviour of the static circuits speed and/or stuttering. Feedback is the amount of signal being fed back into the reverb tank. “Reverb Out” is a dedicated output for the reverb section and can be used for mixing downstream in your rack for those times you don’t want the static interference, just a grainy lo-fi reverb). You can of course also use an external mixer to combine the two outputs. Plugging in a cable into the “Reverb Out” will not stop sending the reverb signal to the static circuit.

“Static in” is a dedicated input for the static circuit. Plugging in a cable here will remove the reverb from the static circuit completely (but still present at the reverb out, as described above). The “Divisions” switch determines the overall speed of the static circuit. There are three different options. The CV input on the static side of the module lets you replace the frequency driven tremolo with a positive CV. Remember that this works as a backwards VCA, ie. shutting the signal up when voltage goes high and leaving it audible when voltage is low. It expects a 0- 5V incoming signal and might not track your incoming envelope perfectly but it does its job! The CV knob lets you either dial in the tremolo amount (when no cable is inserted into “CV”) or attenuates the incoming CV signal. At about 11-12 a clock using the tremolo it should chop the sound up in and makes it grainy. Feeding this CV input an audiorate signal creates bell like tones (similar to a ring modulator) or bitcrushing sounds depending on the division setting and the modulating waveform. This is made possible by using a lighting fast transistor based optocoupler rather than the much more sluggish, standard LDR/LED or vactrol configuration. The “Output” is the end station of the module, when nothing is plugged into “Static In” it contains the reverb and the static circuit in series, when the input to the static circuit is used it just contains the static out. Which means you can use either half of this module if you want, or both, or use the reverb to effect one sound and the static a different sound in patch.

The input attenuator, the acoustic knob, feedback, modulation and static CV amount are all meant to play around with, there are usually several sweet spots here, but remember it is also affected by your incoming signal. Try different incoming signals, and see what you like (VCA’s and filters are usually a good idea too to alter the signal before it hits the bunker). It is also possible and encouraged to use this module without any incoming signal, just turn the modulation switch and introduce noise/drones to the static circuit. Use acoustics and feedback to shape it. Use a 0-5v incoming CV signal to effect the LED/LDR and making different sounds and volume (usually a lower setting on the CV pot here causes bigger changes when using incoming CV). Plug in a steady, or polyrhythmic clock into the static CV in. What do you hear?

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Current draw +12 V [mA]: no info by manufacturer
Current draw -12 V [mA]: no info by manufacturer
Current draw +5 V [mA]: no info by manufacturer
Depth [mm]: 47
Width [HP]: 12
Panel: Red FRP

This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module EXCEPT the reverb brick, which you can get here. All SMD parts are pre-soldered, only trough-hole parts to solder. For build guide please check here.
DIY level: medium.

Broken Tape-Machine Simulator!
NØDSIGNAL is a true stereo broken tape-machine simulator in a 6HP Eurorack module. As such this module is capable of doing vibrato, chorus as well as ring mod(ish) sounds with the right modulation. Input on channel one (left) as well as CV for the same channel is normalled to channel two (to the right). This means you can get a stereo signal out from just a mono input if you prefer, and you can modulate both channels with just a single cv input.  The invert switch inverts the incoming CV signal on channel one before it reaches channel two, creating the opposite of what is modulating channel 1, while the dry/wet switch removes the dry input when pushed down.

Traditionally chorus is done with the dry signal present and with faster modulation, whereas vibrato is done without the dry input and with slower modulation. You can experiment with this, even doing fast cv on one channel and slow on the other. The Station switch presents two different kinds of tape saturation, most notable with the wet signal present. The second mode is an envelope follower of sorts which is shown by the white LEDs tracking the signal. The tune knob, with no CV present at the inputs acts as a tuner of sorts, skipping the tape around when turned. With a CV signal at the input it works as a attenuator for both CV inputs. At maximum setting (full CV) it also acts as a soft bypass for the wet signal.

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Current draw +12 V [mA]: no info by manufacturer
Current draw -12 V [mA]: no info by manufacturer
Current draw +5 V [mA]: no info by manufacturer
Depth [mm]: no info by manufacturer
Width [HP]: 6
Panel: Red FRP

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 please check here.
DIY level: medium.

No Input Feedback Mixer.

Shakti contains no less than 3 different feedback loops in a very small 4HP package. There are 2 internal loops represented by the pots FEEDBACK and FEEDBACK II. Where FEEDBACK is a normal signal, FEEDBACK II is an inverted signal and RECEIVE is an external path (one that you send out from the module, through any other modules of your choice and then back again).

When working with feedback all three of these will intermingle fast which means both FEEDBACK pots and RECEIVE knobs will affect each other. A filter is attached to the first feedback path but since all signals will intermingle in this circuit (it is a mixer after all) the filter will affect all three paths.

Starting with the knob in the middle, it has a lowpass filter to the right and high pass to the left. OUTPUT I contains the inverted signal whereas OUTPUT II contains the normal signal. Shakti can be used as a stereo module since the 2 outputs can differ drastically at times.

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!! WARNING !! DEALING WITH FEEDBACK CAN BE HAZARDOUS TO YOUR EARS AND GEAR SUCH AS OTHER MODULES, SPEAKERS, DAWS, MIXERS ETC. TO BE SURE YOU HAVE HEALTHY LEVELS ALWAYS PLACE AN ATTENUATOR OR ATTENUATED MIXER OUTPUT BETWEEN YOUR MODULAR AND OTHER GEAR. WE TAKE NO RESPONSIBILITY IF GEAR WITHIN YOUR MODULAR OR OUTSIDE IS HARMED BECAUSE OF SHAKTI. YOU HAVE BEEN WARNED! PROCEED WITH CAUTION!

Current draw +12 V [mA]: no info by manufacturer
Current draw -12 V [mA]: no info by manufacturer
Current draw +5 V [mA]: no info by manufacturer
Depth [mm]: 25
Width [HP]: 4
Panel: Red FRP

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 please check here.
DIY level: easy.