Hey all!
Hoping someone can either help or has suffered with this issue on the quad mini. Recently picked up the mini after using the OG for a couple of years and have noticed a really bad overtone/ringing when palm muting (only on specific notes!) - I’ve tried this with multiple guitars, fixed bridges or taped up floyds, fretwrap on the nut and strings behind the bridge taped and muted. Tried everything under the sun to mitigate the issue as at first I thought maybe it was string noise however it definitely isn’t. Input level dropped far behind where it was on the OG quad and have adjusted that to see if it was making a difference, nothing. Regardless of how I have the gain or the gate, regardless of amp model, it’s a constant. Unfortunately being a caveman palm Mute chugs are kind of unavoidable.
This issue is also coming through the headphones out so it’s not a Poweramp issue as I’ve tried multiple of these too 
Hoping to either find a resolution to this or may have to send the unit back. Curious to see if anyone else has encountered this
Link to vid - https://youtu.be/LGmYOnQnJWQ?si=fxv2VHnpGuwvgGjX
Cheers guys!