Audio Input causing high Frequency feedback (over time)

[dlawle]

Hello!

I am attempting to connect Jan Ostman's Minipops clone to a Pro Micro running Mozzi, using the Audio_input.ino example. Here's a simple schematic for the minipops.

From the minipops I have a generic AUX cable running to my Pro Micro connected on pin A0, with another audio out connected to pin 9 for audio out. (Here's a badly mocked up fritzing diagram)

The problem I'm having is that on start, the audio does not have any high frequency (very low registered sounds) and then progressively the high "Gets higher" until you can hear the full frequency, but also with a very high frequency "feedback" sound.

I've tried a few different methods like Low Pass Filters as well as a small cap setup similar to what I'm using in the minipops to no avail. I know it's not the Minipops directly because I've run that for a large amount of time with no increasing issues.

Any idea what's wrong here?

(small note, I've been unable to join the google groups community, so I cannot post there)