Had it hooked up in front of my Brian May Special Vox practice amp. When I adjusted the settings to the slap settings suggested in the manual provided, it seemed to be oscillating pretty bad and making weird noises through my amp. This is with the delay set at around 7. When I upped it to 8 or 9, it went away. As someone who has never owned an analog delay - is this normal? Great delay otherwise. Sounds really warm and it is pretty easy to use.