Doepfer A-105-4, USED

This item is used, has been fully tested and is guaranteed to be working.

Quad Polyphonic VCF

A-105-4 is our first polyphonic filter and contains four identical 24dB Lowpass filters (SSM2044 type). Each filter has available a separate FM input as well as an Audio Input and Output. The FM input is typically connected to the output of the associated envelope generator (e.g. A-141-4). The envelope amount for all four filters is controlled by the FM knob and the CVFM input by means of four built-in VCAs, which are controlled by the FM control and CVFM input. This allows also voltage control of the envelope amounts. In addition common frequency modulation for all filters is possible (e.g. by an LFO). For this the CVF input with attenuator can be used.

The range of the audio input level control (L) allows also clipping/distortion with typical A-100 audio levels (e.g. from A-111-4) at the filter inputs. Even this parameter is voltage controllable as well as the resonance (Q).

In the Box
• The module itself
• Eurorack Power Cable