> my a126 freq shifter suddenly stopped doing his job.
> the audio output still works at normal level but the 3 shifted outs (up,
> down and mixed) are very silent
> and there is no effect to be heard anymore.
> the overload starts clipping at 3 already - input is an osc sawtooth
> directly.
> when the mix poti is in middle setting - the signal is almost mute,
> extreme left and extreme right does give
> a very silent signal.
>
> anybody has an idea what could be the problem

Sounds like a defective quadrature oscillator. You will probably have to
send in the module for repair to the dealer where you purchased the module.

Best wishes
Dieter Doepfer