Given the symptoms you've described, this pretty much has to be a footswitch issue. I would recommend that you do the footswitch function test described here:
http://byocelectronics.com/board/viewto ... 10&t=31545 You will need a multimeter set to its continuity function to perform this test. The key switch lugs for this testing will be the 4-5-6 trio (which handles the input signal path) and the 7-8-9 trio (which handles the output). With the switch
engaged (LED on) you should see continuity between 4 & 5 but
not between 5 & 6, and between 7 & 8 but
not between 8 & 9. In
bypass (LED off), you should see continuity between 5 & 6 but
not between 4 & 5, and between 8 & 9 but
not between 7 & 8.
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