I am trying to sync my DD5 and DD7 to the same tap tempo pedal and have tried this two different ways with both of them unsuccessful. The first way was to just wire both jacks through the SPST momentary (NO) switch and that didn't work. Then I switched to trying to use a probably more appropriate DPDT momentary switch to run each one through its own separate circuit and it has still shown to be unsuccessful. It worked fine when I tested everything unsoldered but after soldering it was unresponsive.

any help or ideas?

the circuit goes jack > green > switch > red > jack