for slight modifications to 3 tonal parameters:
Gain, Timbre, and Symmetry.
Some OD's are high gain that boarder on being
a distortion. Some OD's are low gain that act
more as a dirty boost to push the front end of
your amp. The Gain parameter knob can dial in
just the right amount of gain for the drive knob
to control.
Some OD's are bright and try to recreate the
Fender sound. Some OD's are darker and try
to recreate the older Marshall sound. The
Timbre parameter knob sets the frequency at
which the midrange roll off of the tone knob
occurs so you can get the sound of all the other
amps that are in between.
Some amps become very compressed at high
levels and others have lots of headroom. The
same is true for OD pedals. Some OD's have
symmetrical clipping and sound very
compressed. Some OD's have assymetrical
clipping and sound very open. The Symmetry
parameter knob lets you dial in the perfect
blend of symmetrical and asymmetrical clipping
for the exact type of tube tone that you're
looking for.
The Boost channel has a Pre/Post switch so you
can place the boost either before the overdrive
to change the dynamics of the pedal and push it
into new sonic territory, or place it after the
overdrive for huge amounts of extra volume.
