I paste my not response yet mail sent to support@fryette

This is Juanjo from Barcelona-Spain.
I already receive my PS2 from you after 5 weeks catched in the spanish customs hell...
I tried it today and the section of power/attenuator sounds perfect, awesome... The best Ever!
I have a problem with the "loop effects" section..
When I use that circuit with my delay in it, the amp (JTM45) start to scream
crazy harmonics feedback... Some times work but if I move a little any cable, push the ground button or close my volume guitar potenciometre the crazy screams comes again.
Any advise about this?
I need the PS2 urgently.. Tomorrow start my band tour and I don't know what to do... Help me please.

Thanks and best regards