Hi Dieter,

Thanks.  Are the outputs always a positive voltage

The Behringer Model D manual states that exceeding the rated input voltages can damage it. 

I have no way of knowing if that's true, because I haven't seen the schematics of that either, but I'd rather not rely on it being wrong, or on me not turning the scale knobs past 4, so I want to make up some fixed value attenuators, or similar, to make sure.

Are the outputs direct from an op amp, or is there a resistor between each op amp and the output socket - or is it more complicated than that

- Andy