Electro-Harmonix TRI PARALLEL MIXER Manual page 4

EQ – This knob affects the tonal characteristic of the signal inputted to
the RTN jack. When the knob is at center, there is no effect. Turn the
knob up for a brighter signal (more treble) and turn the knob down for a
darker signal (more bass).
CH 1/2/3 Footswitch – This switch is used to activate/deactivate a
given channel. Double tap any of these switches to enter bypass mode.
When in bypass mode, click any of these switched to enter active mode.
There are other functions these switches can perform, which will be
discussed later.
CH 1/2/3 LED – This LED lights to indicate which channels are active.
There are other scenarios where these LEDs may be blinking to indicate
different options, which will be discussed later in the manual.
There are certain scenarios where signal may be active at a given
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SEND or RTN jack despite that channel being inactive. These scenarios
are discussed in the Advanced Switching Options section.
-ADVANCED SWITCHING OPTIONS-
Before explaining the advance switching options, it is useful to visualize
the signal path of a given channel, which essentially exists in two halves: