I have a Dx50a amp. I have to run a patch cord from Fx out to Fx in to get steady volume. With out it. Only by wiggling the lead in the input jack , can i get volume, that hangs for a second or 2 then it disolves and the volume is gone again. And it takes a lot of messing around to find a sweet spot to get it to do that. Any thoughts to whats going on? It seem to take away from the amp using the way i have been with the patch cable.