Doepfer A-100(~ 40 MB) - Manual (Page 166)

A-111 VCO 2 System A - 100 doepfer
12
5. In- / Outputs
! CV 1 • " CV 2
Sockets ! and " are the voltage control inputs for
controlling VCO pitch. The voltages at these inputs
are summed. Input ! is set to exactly 1 V/octave, and
is normally used for pitch control - for instance from a
MIDI-CV interface, controller keyboard with 1V/octave
output, or the CV output from an MAQ 16/3 sequencer.
Additionally there is an internal CV input with 1V/
octave connected to CV of the system bus. This
signal (for instance the CV from a keyboard via a Bus
Access module A-185), additionally controls the pitch
of the VCO.
H If you are planning not to use the system bus
CV - ie. if there’s no CV signal being sent to
the bus - you should disconnect the bus
from the module, by removing jumper J1 (at
the top right of the main circuit board on the
A-111, underneath the ribbon cable - see
chapter 7, Appendix). If you don’t, there’s
the possibility of interference, caused by the
system bus CV line acting as an aerial.
If you should later want to use the system
bus CV, then simply re-install the jumper.
Input " is used for exponential FM in the sub-audio
as well as the audio range; the level of its signal sent
to the VCO is controlled by attenuator 4.
§ Lin. FM
Socket § is the Linear FM input. Level is controlled by
attenuator 7.
H This input is only suitable for modulation in
the audio range (> 50 Hz), because with
lower frequencies there is the possibility of
pitch instability.