ADDAC System ADDAC105 4 Voice Cluster
The ADDAC105 4 Voice Cluster is a Eurorack oscillator module with four tunable square-wave voices. Each voice has its own FM switch and decay control. Each also goes through its own VCA with an independent trigger input. The four outputs are summed and sent through a multimode filter, which has separate lowpass, highpass, and bandpass outputs. A slew decay shapes the incoming Trigger IN. The filter cutoff CV input can be routed either to the audio signal path or to the frequency control.
It follows the earlier ADDAC103 T-Networks, a module inspired by simplicity. The filter circuit showed up again later in the ADDAC604, a dual filter module derived from the ADDAC105's multimode section. The ADDAC105 is part of the ADDAC100 Series and was also offered as a DIY kit. A custom-colored front panel was available as an option, in red, green, blue, white, silver gray, yellowed silver, and dark or light bronze. It cost extra and took four to six weeks to produce.
Known specs are modest: 8HP, 4.5 cm deep, drawing 40mA on both +12V and -12V. No production years, original price, or user reception are documented. The one price that surfaces is $146.64 on Reverb, and it conflicts with other sources, so treat it as unverified. No electrical measurements beyond power draw have been recorded.
- 4-voice square oscillator, each voice with FM switch and decay control
- Individual VCAs with independent trigger inputs per voice
- Summed output through multimode filter — lowpass, highpass, and bandpass outputs
- 8HP, 4.5 cm deep, 40mA +12V / 40mA -12V
- Available as assembled module or DIY kit
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