DOEPFER / A-111-6 Mini Synthesizer Voice

Variations

The A-111-6 Miniature Synthesizer is a small monophonic synth voice module with all the basic functions of a monosynth. With VCO, VCF, VCA, and envelope in a space of only 10HP, it can be played as a single synthesizer by simply inputting a pitch CV signal and gate signal.

VCO
The VCO that generates the sound can output a sawtooth wave, triangle wave, or square/pulse wave, and simultaneously outputs a sawtooth wave or triangle wave (or OFF) and a square/pulse wave selected by the switch. The pulse width of the pulse wave can be controlled with the PW knob. FM or PWM can be applied by connecting an external CV to the Mod. input.

Balance Unit
The Balance unit is a section that mixes the internal VCO with an external audio source connected to the Ext In. When the Bal. knob, the only control in this section, is turned fully counterclockwise, it mixes only the internal VCOs, fully clockwise, only the external audio source connected to the Ext In, and in the middle position, it mixes both. If nothing is connected to Ext In, the internal sub octave VCO is connected internally and a square wave one octave below the VCO can be used.

VCF
A 24dB low-pass filter controls the brightness of the sound, and has a frequency and resonance control that oscillates itself when the resonance is turned up to maximum. An internal envelope is connected internally to FM1, and the attenuator can be used to control the strength of the envelope.

The filter can also be used as a sine wave oscillator by setting the VCO Wave switch to OFF, turning the PW knob fully clockwise or counterclockwise, and turning the Res knob fully clockwise. FM2 supports a 1V/Oct input for pitch control, so you can play with a pitch scale. （FM2 supports a 1V/Oct input for pitch control, so you can play with a pitch scale (not as accurate as a VCO).

VCA
The VCA controls the volume, which is controlled by an external gate signal or the built-in envelope. Select Gate if you want to control only the on/off of the sound, or select Env if you want to use the envelope to add a gentle rise and reverberation after the sound is made. If you do not want these controls, set the switch to the center position.

The Gain knob controls the volume manually. It is usually turned fully counterclockwise when using a gate or envelope. If you want the module to sound constantly regardless of gate or envelope input, turn this knob clockwise to adjust the volume.

Envelope
The Envelope section, which adds a time signature to the sound, is driven by a gate signal input to the Gate input. The output of the envelope can be visually confirmed by a flickering LED, and is controlled by the Att. knob (attack time) and the D/R knob (decay/release time), and operates in three switch-selectable modes.

AD mode : Operates in two phases, Attack and Decay. When a gate signal is input, it reaches its maximum level in the time set by the Att. knob and immediately decays to its minimum level in the time set by the D/R knob.
AR Mode: Operates in Attack, (Sustain), and Release phases. When a gate signal is input, the maximum level is reached in the time set by the Att. knob, and the maximum level is held while the gate signal is input. When the gate signal goes to 0, it decays to the minimum level in the time set by the D/R knob.
ADSR mode : Operates in four phases: general attack, decay, sustain, and release. Decay and release are controlled simultaneously with the D/R knob, and the sustain level is fixed at 50%.
The CVT input can be used to control envelope parameters via an external CV. Three different settings can be toggled by setting the jumper pins on the back of the module.

Controls Att. only
Controls D/R only
Controls Att. and D/R simultaneously

Width 10HP
Depth 50mm
Current consumption
+12V : 60mA
-12V : 60mA