> Hi,
>
> I just got a 101-1 Steiner filter, and it doesn't seem
> to be acting right. The lowpass and bandpass inputs
> doesn't pass anything, the highpass passes everything,
> the frequency knob does nothing, and the emphasis knob
> does nothing but make a thump-thump-thump noise when
> it's all the way up.

Do the front panel LEDs react as they should

> I've tried all sorts of signals through it to no
> avail. Should I send this back to Analogue Haven, or
> to Doepfer, or is this something I can fix myself

Normally there is nothing you can fix yourself and you should send it back
to Analogue Haven if the module does not work as it should.

Best wishes
Dieter Doepfer