Doepfer

The A110 Module Question made me think that it would help A100 users 
to compile a comprehensive list of known module inconsistencies, 
deviations from the documentation, and other quirks. I invite all to 
add to the list, or correct what's here.

Joe

A110 and A111 VCOs:

The A110 and A111 footage selector switchs extend and operate past the 
marked detent positions, in both directions.

The A110 is one octave higher than the A111, when both are at the same 
footage setting.

The A110's tuning knob is zeroed when fully counterclockwise. The 
A111's tuning knob is zeroed at the center position.

The A110's CV1 socket is normalled to the system bus - the bus 
connection is broken when a patch cable is inserted. The A111's CV1 
socket is mixed with the int.cv signal from the system bus - the bus 
connection is NOT broken when a patch cable is inserted.


A120 and A121 VCFs:

The A120's CV2 and CV3 attenuators go from zero to unity gain. The 
A121's CV2 attenuator only goes to about .5 gain. For this reason, and 
because it has no CV3 socket, modulation routings to the A121 are 
usually patched through an A138a mixer to the CV1 socket.

A140 and A141 ADSRs:

The A140's Gate socket is normalled to the system bus. The A141's Gate 
socket is NOT normalled to the system bus.

The A140's envelope amplitude is significantly higher than the A141's 
envelope amplitude. (someone please measure/verify this.)


A136 Distortion/Waveshaper:

The A136s amplification A knob operates backwards from what is 
described in the User's Guide. Positive amplification increases as the 
knob is turned counterclockwise past 5 (center), and negative 
amplification increases when the knob is turned clockwise past 5.

The A136's positive +A and negative -A knob positions are not the same 
as the amplification A knob positions, contrary to the User's Guide. 
The scales are marked differently, and the +A and -A knobs operate 
backwards from the amplification A knob. Positive amplification 
increases as the knobs are turned clockwise past 0 (center), and 
negative amplification increases when the knob is turned 
counterclockwise past 0.

The A136 performs hard clipping at the maximum and minimum extents of 
its clipping levels, in addition to its adjustable clipping. This 
isn't documented in the User's Guide. Signal levels from Pitch CV and 
LFO signals extend past this hard clipping level, so these should 
normally be attenuated before patching to the A136 (unless you want 
the hard clipping).