How can I merge an AC audio feed and a headset cable into one stereo male jack going into a DC device? I believe that is the issue I’m dealing with. For more info the post listed below may help. Thanks!
Probably something like this:
Here’s the forum topic that this image came from: https://forum.audacityteam.org/t/3-5mm-to-external-audio-card-problem/20644/4
Even with a suitable battery supply, the microphone signal may still be too small to drive your stomp box properly.