I discovered that if a strong amplification is present in my Puredata patch, it results in a high pitch background noise. (probably a Clock)
After investigating, I found that the noise is coming from my Keystep plugged into the Lich's USB A host.
I discovered that if I unplug the Keystep, the noise disappears, normal, but if I plug it back in the noise does not come back! 🤪
I am going to do tests on longer usage times today, to confirm that the noise does not come back after a while, but if it does not come back, then maybe by changing the firmware so that the usb device will be powered only after the total start of the Lich could probably solve the problem, well if it is technically feasible of course!