Doepfer

Hello Dieter,

Thanks for your earlier responses.  I dropped this thread and have been using my old 177, but I'd like to use the 177-2 if possible, so here are some more comments/questions:

--- In Doepfer_a100@yahoogroups.com, <yahoo@...> wrote:
>
 > I suppose that it has to do with the bouncing of the contacts of your foot
> pedal (i.e. that releasing the pedal is not a clean on/off transition but a
> sequence of on/off/on/off transitions until the final state is reached). If
> the A-177-2 is used to switch a signal (e.g. by means of the A-150) this
> causes no problems but if the foot switch is used as a trigger (e.g. S&H or
> clock circuits) this may lead to a problem. Especially older contacts may
> generate a lot of bouncing. 

You're right about the 150, but when I use it with the 151 it goes crazy, and is basically unusable.  Each trigger causes a flashing of lights and moves an unpredictable number of stages in the sequence. 

> Maybe adding a capacitor to the inputs will
> solve the problem. They would work like low pass filters that filter the
> bouncing pulses. One has to try it out as it depends upon the bouncing
> behaviour of the contacts. I'd start with ~ 100nF connected between GND and
> the foot switch inputs.

Sorry, but I'm ignorant about these things -- how would I do this exactly?


> > And isn't the behavior I mentioned in my second message quite
> > strange?  I'll quote it again here:
> >
> > "If I have output #1 from the 177-2 double footswitch patched to
> > the 165 trigger modifier input, and nothing patched from output
> > #2, only pressing footswitch #1 shows up on the LEDs on the 165.
> > Footswitch #2 appears to do nothing. So far so good. However, if
> > I patch from the mini-mult of the 165 to the trigger input of the
> > S&H 148, then even though only #1 registers on the 165, BOTH
> > footswitches #1 and #2 pass gate on to the S&H."
> 
> That's indeed strange. I'll try to copy the behaviour in our demo system. It
> probably has to do with glitches and bouncing and the different input
> behaviour of A-165 and A-148 in case of glitches at the input.

Did you happen to get a chance to look at this?  

Thanks again!
Ernst