Doepfer A-111-6 Miniature Synth

Complete miniature synthesizer voice module.

Specifications

VCO
triangle core VCO
frequency range: about 32 Hz - 16 kHz
precise 1V/oct tracking: about 32 Hz - 4 kHz
Tune: manual tune control (with an internal jumper the range can be set to ~ +/-1 half an octave or ~ +/-2.5 octaves)
Oct.: range switch -1 / 0 / +1 octave
Mod.: modulation depth (attenuator wired to the Mod. socket)
Dest.: switch that is used to address the modulation to frequency modulation (position FM) or pulsewidth modulation (positon PM), in center positon no modulation
PW: manual pulsewidth control for rectangle waveform, PW can be also modulated by the Mod. input as mentioned above
Wave: waveform switch (sawtooth / off / triangle), the sum of the waveform chosen by this switch and the rectangle is fed into the VCF (to turn the rectangle off the PW control has to be set fully CCW or fully CW)
1V/Oct. (socket): external CV input for VCO frequency (1V/octave)

VFO
24 dB low pass
Frq.: manual frequency control
FM1: frequency modulation depth (attenuator wired to the VCF FM1 socket, the socket FM1 is normalled to the internal Envelope signal and then FM1 controls the modulation depth of the internal envelope applied to the filter)
FM2 (socket) : second CV input for VCF without attenuator (about 1V/octave), the socket FM2 can be normalled to the 1V/Oct socket of the VCO by means of an internal jumper, in this case the VCF frequency follows the VCO frequency (so-called VCF tracking)
Res.: manual resonance control (up to self oscillation)
if the VCO is turned off (waveform switch = center position, pulsewidth control = fully CCW or CW) and the VCF resonance is set to maximum the module can be used as a sine oscillator, the tracking at socket VCF FM2 is about 1V/octave (not as precise as the VCO but much better than most other filters)
~ 11 octaves frequency range (~ 10 Hz - 20kHz)