Doepfer

I just got my A-190 and was able to play my A-110 into my monitoring
setup finally.  Saw, square, and triangle work fine, but it doesn't
seem to be playing a sine wave at all.  I've noticed that if I have
the pulse width knob too far to the left or right, the square wave and
I think it was the triangle wave, will cut out, but that's not the
case with the sine, it doesn't put out sound no matter what I do with
the knobs.  Anything else I can try?  Or did I get a defective module?