A.INPUT —This input accepts either an XLR or 1/4" plug:
The XLR connection is a balanced input:
(Pin 1=ground, Pin 2=positive, Pin 3=negative)
The 1/4" connection is an unbalanced "TS" input:
(Tip=positive, Sleeve=ground)
B.PHANTOM POWER—Use as needed for microphones connected to the XLR input {A}. This button does not affect the 1/4" input.
Out—Phantom Power off
In—Phantom Power on
C.GAIN—Adjusts the preamp signal level. Gain is also the primary level control for the Effects Send {S} jack on the rear panel and can be used to accommodate the input sensitivity of your effects equipment, if necessary.
D.–10 dB PAD / PREAMP CLIP—The Pad button reduces input sensitivity by –10dB to provide cleaner response with high
output sources. Use Pad if the 
Preamp Clip LED indicates that the input buffer is being overdriven.
Out—Pad off
In—Pad on
E.PHASE—Reverses the phase of the input circuit, useful for reducing "regenerative" feedback generated when you are standing at a particular distance from the amplifier. You can also reduce feedback by changing your position or distance from the amplifier.
F.AURAL ENHANCER—A trademark SWR® feature, the Aural Enhancer brings out the fundamental low notes of the bass, brightens high-end transients and reduces certain frequencies that mask the fundamentals. The ultimate effect is a more transparent sound that opens up the sibilance characteristics of all instruments without being harsh.
How the Aural Enhancer works: Think of it as a variable tone control that changes frequency range and level according to where you set the Aural Enhancer control:
As you rotate the control clockwise from the Min position, you are elevating low, mid, and high frequency levels in ranges that are different, yet complementary to the Bass and Treble tone controls. The “2 o’clock” position—a favorite for many players—
brings out both low end fundamentals and crisp highs, while at the same time, adds a little lower midrange helping you to cut through the band. Then, as you rotate further clockwise, selected mids will drop off—specifically, a group of frequencies centered around 200Hz. While apparent, the Aural Enhancer is gentle compared to the extreme response curves you can create with the EQ tone controls.
G.BASS / MID / TREBLE—Three semi-parametric tone controls
that allow you to boost or cut signal levels at the 
frequencies you choose. Select a frequency range 
center point using the outer knob, then adjust 
signal level in that range with the inner knob. Mid 
range adjustment is critical for most instruments
and what sounds good will depend on your situation—what sounds harsh while playing alone may sound just right in a crowded room, or on a recording.
H.EQ BYPASS—Puts the tone control circuits in or out of the signal path as indicated by the 
LEDs.
I.EfFECTS Blend—Functional only when a plug is inserted into the Effects Return {S} jack, this knob sets your effects level by controlling the amount of "wet" effects loop signal blended into the "dry" preamp signal.
J.EfFECTS BYPASS—Takes the effects loop circuit out of the signal path as indicated by the 
LED.
K.COMPRESSION—Adjusts the level of signal compression. Rotate fully counterclockwise for no compression and rotate clockwise to increase the ratio of compression. The brightness
of the 
LED indicates the active amount of compression moderating peak signal levels.
L.Master Volume—Use to set the loudness output from the speakers after all other levels are set, including any external effects levels.
M.MUTE—Disables all unit outputs except the Tuner {T}, Headphones {R} and Effects Send {S} jacks. Useful when tuning
your instrument and for quiet sessions. The 
LED illuminates when Mute is active.
N.POWER SWITCH—Switches the unit ON-OFF as indicated by the 
LED.
