If using BOSS TONES STUDIO (BTS) for GT-100 and programming the ACCEL/CTL footswitch functionality, you CAN set FX CHAIN - ACCEL: TYPES like S-BEND, LASER BEAM etc. However, if you'd like to program the ACCEL/CTL for other FUNCTIONS you'll have to do it on the GT-100 itself and unfortunately the MENU doesn't seem to be available on BOSS TONE STUDIO software editor.
To program the ACCEL/CTL pedal to control OD/DS - ON/OFF for example:
- Press [CTL/EXP] and with KNOB 4 select ACCEL/CTL icon in the LEFT SCREEN and adjust ACCEL/CTL parameters in the RIGHT SCREEN.
- Use KNOB 5 to set FUNC: to OD/DS
- Use KNOB 8 to set SOURCE MODE to: TOGGLE.
- Press [WRITE] twice to WRITE/SAVE your settings to your current PATCH LOCATION.
- Press [EFFECT] to return to FX CHAIN VIEW, use KNOB 4 to scroll to OD effect icon.
- Press ACCEL/CTL foot pedal and visual and audio test and check OD/DS icon and sound.