ADDAC System 4-Voice Cluster (Model 105)

This is a fun little 4x square oscillator voice with FM that excels at chiptune-esque sounds thanks to a built-in multimode filter and decay envelope. Note that it is not calibrated for 1V/octave tuning—but it's great for beeps, bleeps, chirps, and bloops. From the manufacturer:

This is a 4 voice Square Oscillator with VCA, FM switch and a slew decay for the incoming Trigger IN. All voices are then sent through a Multimode Filter. Each voice has it’s own VCA input where any input is accepted (Trigger, Gate, CV) The [DECAY] controls the slew decay applied to the incoming signal, if [DECAY] is fully anti-clockwise then it works as a Mute. The [FM ON] switches activate/deactivate the FM input coming from the previous voice: Voice 1 FM comes from voice 4, voice 2 FM comes from voice 1, and so on, so you can FM all of them in a FM loop.

All 4 voices are summed and sent through a filter with controls over [CUTOFF] with an Attenuverter for the CV input and [RESO- NANCE]. Three filter outputs are provided [LOWPASS], [BANDPASS] and [HIGHPASS]

The [EXTERNAL IN] input can be routed through a jumper on the back of the module allowing the incoming signal to go to the filter input for processing an external audio source or all of the 4 voices. Frequency control allowing for some experimental CV control over pitch of all 4 voices at the same time (due to the specificities of the circuit and to keep the module at a low price these inputs are not calibrated to 1v/octave).

Width: 8HP

Depth: 45 mm

Power: 40mA @+12V / 40mA @-12V