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DL4 problem

Maybe someone has an idea about this...I've had the DL4 running problem-free for going on two years now.  Always connected the same way - Hosa insert patch cable (1) connected from the L input/L output to the channel 1 (same channel as my clip-on mic) insert on my Mackie 1202.  Recently, I was getting a tone (registering as a high D# on my tuner) generated thru the system, which I was able to trace to the DL4.  I put in an different Hosa cable and the sound got slightly louder.  I have a performance this Friday, so I went and bought another DL4, adapter and a Monster patch cable - same thing, except that now - regardless of which unit or cable - tone generation seems to be intermittent (?...), but putting an insert in the Mackie jack 'deadens' the mixer - no levels on my effects with it plugged in exactly where it has always been.  Anyone have any idea?

Tom Heasley

Tom Heasley
427 Alma St., Suite 206         Palo Alto, CA  94301
P:  650.322.3633                F:  419.831.3809