Bypass; Using The Foot Switch - Alesis ModFX Reference Manual

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Using the Philtre

Bypass

This button sends the signal directly from the input to the output
without any effect. Press [BYPASS] to check the sound of the
source without any effect from the Philtre. When the red
BYPASS LED is lit, phasing is turned off. The Bypass function
can also by activated by the foot switch.
Since the Philtre is a digital effect, signal always passes through the
digital A/D–D/A conversion process, so that digital signal will
flow through to other effects in a ModLink chain even when
[BYPASS] is on. So, unlike old analog effects, this is not a
"hardwire" bypass switch—the Philtre must be powered on to
pass signal through, even in bypass mode. Similarly, the [TRIM]
control is always active, since it's an analog control regulating the
level feeding the analog-to-digital converters.

Using the Foot Switch

If you need to bypass the effect but your hands aren't free, simply
connect any momentary footswitch (such as those used for
keyboard sustain pedals, either NC normally closed or NO
normally open) to the [FOOT SWITCH] jack on the rear panel.
The footswitch will turn the BYPASS LED on and off.
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