Ext_Sw (In/Out for foot switch?)
The area on the board marked 'EXT_SW', is that for the in/out of the footswitch? If not, where is the in/out for the switch located?
the EXT_SW is for a tap-tempo, or other digital switch. it replicates the button feature on the rotary encoder. to install a switch for bypassing the audio, just use the 1/4" jack IN and OUT. there is a discussion of that here:
viewtopic.php?f=28&t=479