The Roland SDE-330 has a Bypass function which allows the incoming signal to
pass directly though the SDE-330 unaffected. Use one of the following
procedures to enable Bypass:
1) Press the BYPASS button. The buttons LED will light.
2) Connect a momentary contact-type footswitch (FS-5U, DP-2) to the BYPASS
jack in the rear of the unit and press it to toggle Bypass on and off. The
BYPASS buttons LED will light.