I'm just starting to test my Pepper (and I'm new to modular synthesis, please forgive my ignorance).

I suspect I must have messed up something in the wiring for my knobs. Here's my attempt at describing the issue:

  • knobs 0-3 appear to work fine.
  • knobs 4-7 do not send data into my PD patch. if I send signal from adc~ 7,8,9,10 to the scope, it is a flat line around 0
  • these knobs do seem to work as attenuators for the analog input. If I send signal out a dac~ and patch it into inputs 4,5,6, or 7, the signal shows up in the scope and the knobs attenuate this signal
    - however I believe that the signal is switched around, so that the knob I would expect to attenuate input 7 is instead attenuating input 4, and so on. (never mind I think I was just getting confused)
  • possibly unrelated: I can't seem to get full range of input on any input channel - if I send a phasor~ from the output to any input it will only reach a maximum of around 0.5 on the scope. this may also be due to me not understanding how this is meant to work!

I am reasonably certain that all of the pins are sitting nicely, and I have correctly attached the jumper pins on the back.

I recognise this might be rather difficult to diagnose over the internet, but any help would be great. I am hoping that I have either misunderstood something or I swapped some pins around somewhere that I can fix easily enough!

    yannseznec knobs 4-7 do not send data into my PD patch. if I send signal from adc~ 7,8,9,10 to the scope, it is a flat line around 0

    Can you show the jumper settings at the back of your Pepper?

    yannseznec possibly unrelated: I can't seem to get full range of input on any input channel - if I send a phasor~ from the output to any input it will only reach a maximum of around 0.5 on the scope. this may also be due to me not understanding how this is meant to work!

    that's expected. Outputs have a 0V:5V range, while the inputs are 0V:10V.

          giuliomoro that's expected. Outputs have a 0V:5V range, while the inputs are 0V:10V.

          ah cool yes ok, so I just need to code for that. thanks!

          giuliomoro Can you show the jumper settings at the back of your Pepper?

          yes, here are some pictures.

              oh I didn't take a picture of the audio output header, I assumed it was not relevant. I have those jumper pins set to "amplified audio w/ rack 12v".

              hmmm you seem to be using 5x1 headers there for the analog vs digital selector, but it's actually meant to be an L-shaped arrangement with 4x1 and a 2x1, then to use the analog inputs you need to use an additional jumper to bridge the 2x1 one (labelled "analog") together besides the one you already have there.

              ah ha right ok so I definitely missed that, but I suspect I can add an extra pin relatively easily to each one (or, more likely, I could just decide to only use them as digital inputs for now).

              does that make sense in terms of the issue I was having though? the analog inputs seem to work fine and the knobs attenuate them, it's just that the knobs don't seem to work on their own.

                OH WAIT actually when I think back on my debugging process, this definitely makes sense. I initially had the last two inputs set to digital input, and those knobs were working fine. So I think in the short term I'll just switch to four digital inputs (mainly because I seem to have lost a bunch of the little jumper pins...)

                so far all of my Pepper "issues" are actually just user error 😃

                yannseznec can add an extra pin relatively easily to each one

                Yes

                yannseznec does that make sense in terms of the issue I was having though?

                Yes, those jumpers are providing the 10V voltage reference for the pots, which is only used when there's no jack plugged in.