Excitation (audio signal) in USB host mode

Hardware Tickle
6

hi

  1. USB HOST MODE with Axoloti works perfect! In seconds I could control a synth with the MIDI input coming from Tickle. Just connecting USB out of the tickle to Axoloti USB input Yeah, this is promising!

  2. Audio out from excitation: I have to admit that I tested it with a mono minijack connected to my mixer (using a stereo jack to minijack adapter) that is what I have now in my home studio. Tomorrow I will go to the uni and get a mono cable even if I have to deal with the virus haha.

If I connect it to Axoloti, what I hear is the sum of three sounds:

  1. a different tone for each of the hexagons
  2. the sound from the piezo
  3. a carrier in the background (see photo).

This is only the carrier without touching the Tickle:

Sprectroid screenshot
Sprectroid screenshot1920×1080 688 KB

If I connect it to my Laptop, I hear:

  1. the sound from the piezo
  2. the same carrier

If I connect the USB to a charger to Tickle (no USB host) I hear:

  1. the sound of the piezo
  2. some interference in the background but acceptable

Is this what is expected, or an issue with impedance, or an issue with the cable?

thanks