A-191 Midi-to-Cv Interface / Shepard Generator

Module A-191 is a combination of a MIDI-CV interface and a Shepard Generator. Most of the controls, indicators and in/outputs have a double function; there is a switch which toggles between the two sets of functions.
In use as a MIDI-CV interface, 13 of the 16 control voltage outputs are dedicated to sending voltages converted from a particular MIDI controller (such as Mod Wheel, Volume, Pitch Wheel, Aftertouch, etc.). Controller messages on your chosen MIDI channel are converted into voltages in a range from 0 to 5 V. The other three sockets output an internal LFO generated in sync with MIDI clock, in three waveforms: sawtooth, triangle and rectangle.

In use as a so-called Shepard Generator, the sockets output eight different phases each of a triangle and sawtooth wave. The Shepard Generator creates in combination with other modules (VCO's, VCF's, VCP's, VCA's, Mixers) psycho-acoustic so-called Barberpole effects like never ending rising (or falling) phasings (with VCPs), filterings (with VCF's) or tones (with VCOs). To create the Barberpole effect you need the required additional modules in your system. For a good Barberpole effect we recommend a minimum of 4 VCP's (or VCF's or VCO's) and 4 VCA's (linear types A-130 or A-132). With 8 modules instead of 4 the sound becomes more smooth and tight.

All A-191 settings can be saved into non-volatile memory.

For more detailed information please look at the English user's guide alternatively as html file (for browser view) or as pdf file (for printout).

Attention: A-191 requires an additional +5V power supply with 50mA e.g. the low-cost 5V adapter !