hi dieter,
this is perfect!
thanks for the help :)

cheers,
mark

--- In Doepfer_a100@yahoogroups.com , <yahoo@...> wrote:
>
> The resistors R3 (10k) and R4 (3k3) define the max. amplifications in the
> left (R3) and right (R4) position of the range switch. Lowering the values
> of these resistors (or simply soldering resistors in parallel) causes higher
> amplifications. R3 is located left from the level control (top view to the
> front panel), R4 left from the upper In socket.
>
> The formula for the amplification is 1 + 10k/Rx. The non-inverting amplifier
> circuit is used (see A-100 DIY page for details). In this circuit R1 is 10k
> and R2 can be switched to 10k or 3k3.
>
> Best wishes
> Dieter Doepfer
>