If the noise is still there, then I recommend contacting support@eventide.com and sending them the same video. They can take you through some further steps to diagnose the problem. They’ll probably ask you to backup your presets, reinstall the firmware, and conduct a factory reset.You can try that now, but if that doesn’t fix the problem, the unit may need to be serviced, though this is the first time I hear a squeal of this nature.