Rivera Sedona Owner's Manual page 6

Channel 2-Unbal input
This is a normal non-balanced input for unbalanced instruments. Most electric and acoustic guitars
have a non-balanced output.
Channel 1
Channel 1
Both channels can be used simoultaneously. This can allows you to have separate
EQ for you Mic and your Guitar in Channel 2.
Channel 1 should be used for your Mic or Taylor ES-equipped guitars for maximum volume and
tone when balanced. You can also use Channel 1 with non-balanced guitars.
Volume
Although it's labeled "Volume," this control also adds gain. A simple rule of thumb is, the higher
the Volume is set, the more overdrive you'll get.
Treble (with Pull Bright switch)
This treble control is similar in operation to the one on Channel 1. In addition, it has a built-in Pull
Bright switch. When pulled, it adds highlights to the tone. This is very useful for acoustic
instruments. If the treble frequencies are too extreme when the control is pulled, try setting the
treble control to a lower number and the Pull Bright switch off, and compare this tone to what you
get with the treble control at a higher setting. Note: Refer to the section on the Presence control for
an explanation of its relationship to adding brightness.
Middle (with Pull Notch switch)
The midrange circuit has a slight notch in the frequency spectrum at about 550 Hz, and turning the
knob alters that notch's depth. Its Pull Notch switch shifts the notch's frequency center down to
about 250 Hz. For reference, most 1950s "tweed" amps have their notch centered at 550 Hz, while
classic "blackface" amps have theirs centered at 250 Hz. Large-bodied acoustic instruments, such as
guitars and cellos, will have fewer feedback problems caused by resonant droning if the Pull Notch
switch is engaged.
Bass The "chunk" and support that form the backbone of your tone come from this control. Its
effect on your overall sound will be different at high and low volumes due to the speaker's
characteristics and how much distortion you use.