An old version of the Boss CS-1 compressor with the bypass indicator wired as battery check led. Led is only active with the footswitch pressed down.
![Boss CS-1 bypass mod](https://www.zeta-sound.se/wp-content/uploads/IMG_20221012_153735-1024x768.jpg)
Circuit board modified for led indicator as “effect on”.
![Boss CS-1 bypass mod](https://www.zeta-sound.se/wp-content/uploads/IMG_20230108_195926-1024x768.jpg)
An old version of the Boss CS-1 compressor with the bypass indicator wired as battery check led. Led is only active with the footswitch pressed down.
Circuit board modified for led indicator as “effect on”.
Repair of an old Ibanez UE 3030B multieffect.
Fixed an annoying 100Hz hum.