Home › Forums › Products › Stompboxes › H90 squeal when usb plugged in › Reply To: H90 squeal when usb plugged in December 22, 2022 at 9:24 am #167892 joecozziModeratorEventide Staff You guessed it. Ground loops are definitely a challenge in most studios. Experimentation is the only way to find out the problem areas. Thanks for reporting back.
