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doepfer

System  A - 100

MCV 16

  A-191

3

3.  Switching between the functions

Because the A-191 has two separate functions in it,
which share some of the controls and outputs, at any
one time it can be used 

either

 as a MIDI-CV interface

or

 as a Shepard Generator. To switch between the two

you simply press a button (see below).

The A-191’s controls and in / outputs for
each function are explained in their
respective sections of this manual.

Mode button

To switch between functions, press the 

lowest mode

button  

7

7

7

7

.

LED

LED 

8

 

lights 

when the 

Shepard Generator

 is active;

otherwise it’s the MIDI-CV interface which is active.

If the A-191 receives 

MIDI clock

, LED 

8

flashes (see chapter. 4.2,  

"

  MIDI In).

4.  MIDI-CV interface

4.1  Basics

In its MIDI-CV mode, the A-191 provides a MIDI-CV
converter, and a MIDI-synchronized LFO.

Whenever the A-191 receives 

relevant MIDI control-

ler messages

 on the channel you’ve selected, it con-

verts them into control voltages (in a 0 V to +5 V
range), and sends these out on the corresponding CV
outputs. Table 1 on page 4 lists the MIDI controllers,
their corresponding CV output sockets, and their de-
fault values.

After switching your A-100 system on, pres-
sing the 

Store/Reset button

 

9

 sets the

voltages at the 

CV outputs

 to the

 default

values

 (see table 1).

If you’re running your A-100 from a MIDI
sequencer, you’ll need to save the appro-
priate MIDI controller messages at the begin-
ning of a Song, to initialise the A-191’s CV
outputs correctly.

Summary of Contents for A-191

Page 1: ...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 th...

Page 2: ...ator or MIDI interface 8 LED Indicator to show which out of the Shepard Generator or MIDI interface is selected 9 Reset Store Button for saving set ups or resetting Shepard Function Generator In Outpu...

Page 3: ...191 receives MIDI clock LED 8 flashes see chapter 4 2 MIDI In 4 MIDI CV interface 4 1 Basics In its MIDI CV mode the A 191 provides a MIDI CV converter and a MIDI synchronized LFO Whenever the A 191 r...

Page 4: ...ng the clock rate You set the divisor either with MIDI controller 92 Tremolo Depth or manually with buttons 2 and or 3 The note length N of a full cycle of the waveform generated by the LFO follows th...

Page 5: ...nstance those of the A 145 LFO The waveforms on the A 191 LFO are digital stepped If you use it to control eg a VCO the result is less of a smooth continuous pitch sweep and much more akin to a glissa...

Page 6: ...simultaneously hold down buttons 2 and 3 learning mode is activated This is signalled by LEDs 5 6 and 8 all flashing at once You can now set the MIDI channel you want the MCV16 to respond to To do th...

Page 7: ...see chapter 4 1 Basics AT C16 These 13 sockets output the control voltages conver ted from their respective MIDI controllers see table 1 Their voltage range is from 0 V to 5 V MIDI In This MIDI input...

Page 8: ...age source the A 118 s random output The intensity of this modulation is controlled by the modulation wheel output C1 on the A 191 Amplitude modulation The intensity of the amplitude modulation create...

Page 9: ...ynthesizer patch with multiple modula tion possibilities VCO 1 A 132 VCO 2 A 138a CV 1 MIDI In MIDI Out A 190 CV 2 A 122 A 130 ADSR 1 A 131 ADSR 2 A 118 A 132 Gate MIDI Thru A 191 LFO MIDI In A 132 QC...

Page 10: ...s of the sequence the filter is opening and in the last four 1 8th notes it s closing Another example of MIDI synchronised use of the internal LFO is shown in Fig 5 Two A 125 phasers set to opposite p...

Page 11: ...epfer System A 100 MCV 16 A 191 11 Fig 4 MIDI synchronised stereo phasing CV 1 MIDI In MIDI Out A 190 Gate MIDI Thru MIDI Sequencer A 191 MIDI In LFO A 175 Out L Out R VCP 1 CV VCP 2 CV VCF VCA ADSR V...

Page 12: ...ic sound stage panning see chapter 5 3 User examples The triangle wave signal is sent via outputs T 0 to T 315 and the sawtooth wave signal is sent via out puts S 0 to S 315 where the numbers refer to...

Page 13: ...or see table 3 The mode cho sen is indicated by LEDs 5 and 6 These settings are only temporary if you want to save them press button 9 see below 5 LED 6 LED LEDs 5 and 6 show the Shepard mode selected...

Page 14: ...ard generator s sawtooth waveform controls the pitch of eight VCOs all with identical settings while the tri angle outputs control 8 VCAs one for each VCO To hear the effect properly the outputs from...

Page 15: ...armonics re starting at the bottom once they ve reached the highest frequency The result is to our ears a tone which is rising all the time but never gets any higher The same applies in the down mode...

Page 16: ...ou use two tri angle wave outputs which are 180 out of phase with each other With four triangle waves which are 90 out of phase with each other and four VCAs whose outputs are fed to a quadraphonic so...

Page 17: ...doepfer System A 100 MCV 16 A 191 17 Fig 9 Patch for quadraphonic spatial effects Quad Space VCA 1 T 0 VCA 2 T 90 VCA 4 T 270 A 191 VCA 3 T 180 Audio In...

Page 18: ...ltiple copies of your composite diagram and use them for remembering good patches and set ups P Draw in patchleads with colored pens MCV16 MIDI In S0 LFO MIDI CV SHEPARD Freq T0 LFO S90 LFO T90 AT S18...

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