The amplification range of my A-138c is not -1 to +1, but something
like -0.9 to +0.9. According to the manual, the range can be changed by
replacing a resistor. I wonder, if it would be difficult to get very
accurately -1 to +1

I am routing keyboard CV through the A-138c and precision is needed. As
it is now, I need to add (and tweak) an extra amplification module to
compensate.

Does anyone know, how accurate the Serge 3p is
http://www.analoguehaven.com/bananalogue/3p/


Best regards
Jari Jokinen