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doepfer
S0/
LFO
T0/
LFO
S90/
LFO
T315/
C16
MIDI
In
H
Connecting the A-191 to the system bus
requires an additional special power sup-
ply (+5 V / 50 mA).
System A - 100
Frequ. +
Frequ. –
Mode
MIDI /
SG
MCV16
Reset/
Store
1. Introduction
Module A-191 is a combination of a MIDI-CV inter-
face 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 gene-
rated in sync with MIDI clock, in three waveforms:
sawtooth, triangle and rectangle.
In use as a Shepard Generator, the sockets output
eight different phases each of a triangle and sa-
wtooth wave. Using a variety of modules, the Shepard
Generator can create some interesting psycho-
acoustic effects.
All A-191 settings can be saved into non-volatile
memory.
A-191
MCV 16
1
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Related Manuals for DOEPFER A-191
Summary of Contents for DOEPFER A-191
- Page 1 A-191 doepfer MCV 16 1. Introduction Module A-191 is a combination of a MIDI-CV inter- face and a Shepard Generator. Most of the controls, Frequ. + indicators and in/outputs have a double function; there is a switch which toggles between the two sets of functions.
-
Page 2: Controls And Indicators
A-191 System A - 100 doepfer MCV 16 2. MCV16 - Overview Controls and indicators 1 LEDs : Indicators for triangle and/or sawtooth waveform frequency MCV16 2 Freq. + : Button to increase LFO frequency MIDI-CV / SHEPARD 3 Freq. – :... -
Page 3: Mode Button
MCV 16 3. Switching between the functions 4. MIDI-CV interface Because the A-191 has two separate functions in it, 4.1 Basics which share some of the controls and outputs, at any In its MIDI-CV mode, the A-191 provides a MIDI-CV one time it can be used either as a MIDI-CV interface converter, and a MIDI-synchronized LFO. - Page 4 A-191 System A - 100 doepfer MCV 16 The A-191’s internal MIDI-synchronised LFO has three Output corresponding MIDI controller default [V] waveforms - sawtooth, triangle, and rectangle. After Touch This LFO is only active when a MIDI clock is being...
- Page 5 MCV 16 Because the A-191’s LFO is purely a soft- ware device, the following considerations apply, which it’s well worth remembering. The A-191 uses an 8-bit D/A converter, whose maxi- mum resolution is 256 steps per 0.02 V. Conse- Fig. 1: The sawtooth (1/2 note cycle) generated by quently, the sawtooth and triangle waves can’t be as...
-
Page 6: Indicators And Controls
1 LEDs MCV16 to respond to. To do this, send a valid MIDI controller (see table 1) to the A-191. This automati- The LEDs 1 indicate the frequency of the internal cally ends learning mode, the LEDs go out, and the LFOs. - Page 7 Pitch Wheel, #01, #02, #04 to #08, #10, #11, #12 and ! CV outputs #16, and turning them into voltages available at the corresponding CV outputs (see table 1), the A-191 Sockets ! are the MIDI-CV interface’s CV outputs: also responds to MIDI clock - and to MIDI controller #92 ("Tremolo Depth") for controlling the internal...
- Page 8 2 VCOs, VCF (A-122) and VCA (A-130). Modu- • Overall volume les A-190 and A-191 act as the link to a MIDI key- board, and are set to the same MIDI channel. The The overall volume of the output signal sent to the...
- Page 9 System A - 100 A-191 doepfer MCV 16 MIDI A-130 A-131 VCO 1 A-138a A-122 CV 1 MIDI In A-190 A-132 VCO 2 A-132 ADSR 1 ADSR 2 MIDI Thru Foot A-118 CV 2 Gate Mod. Wheel A-132 MIDI In...
- Page 10 A-191 System A - 100 doepfer MCV 16 CV 1 MIDI - MIDI In MIDI In Sequencer MIDI A-190 ADSR MIDI Thru A-191 Gate Fig. 3: VCF cutoff control with a MIDI-synced LFO. Set the LFO frequency so that it completes one cycle Another example of MIDI-synchronised use of the every whole note.
- Page 11 System A - 100 A-191 doepfer MCV 16 ADSR CV 1 MIDI - MIDI In Sequencer MIDI A-190 VCP 1 MIDI Thru MIDI In Gate A-175 A-191 VCP 2 Fig. 4: MIDI-synchronised "stereo" phasing.
- Page 12 A-191 System A - 100 doepfer MCV 16 5. Shepard generator 5.1 Basics A Shepard generator is a modulation oscillator, which produces various phase inversions of triangle and sawtooth waveforms at its outputs. S 90 T 90 The way the Shepard generator is set up produces various psycho-acoustic phenomena, such as the ‘barber-pole’...
- Page 13 System A - 100 A-191 doepfer MCV 16 5.2 Indicators and controls Mode Effect 8 rising sawtooth waves 1 LEDs 8 falling sawtooth waves The LEDs 1 give you a read-out of the frequency of 4 rising sawtooth waves at outputs the Shepard generators.
- Page 14 A-191 System A - 100 doepfer MCV 16 5.2 In- / Outputs 5.3 User examples ! CV outputs Generating "Shepard Tones" The CV output sockets ! send out sawtooth and The Shepard Tone is a psycho-acoustic phenome- triangle waveforms. The number on each output...
- Page 15 System A - 100 A-191 doepfer MCV 16 gradually get quieter again, until the highest frequency is reached, and it’s inaudible again. VCO 1 VCA 1 Meanwhile, other harmonics have been replacing it, starting very quietly at the lowest frequency.
- Page 16 A-191 System A - 100 doepfer MCV 16 Alright, we have to admit that to use the Shepard ge- Audio In nerator to maximum effect does take a huge number of modules. There aren’t going to be that many Sy-...
- Page 17 System A - 100 A-191 doepfer MCV 16 Audio In A-191 VCA 1 VCA 2 Quad Space T 90 VCA 3 T 180 VCA 4 T 270 Fig. 9: Patch for quadraphonic spatial effects...
- Page 18 A-191 System A - 100 doepfer MCV 16 6. Patch-Sheet The following diagrams of the module can help MCV16 MCV16 you recall your own Patches. They’re designed so MIDI-CV / SHEPARD MIDI-CV / SHEPARD that a complete 19” rack of modules will fit onto an...
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