Sunn 021-3303, Instruction Manual, Page: 5 / 28

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E. CH.1 SEND - This knob adjusts the channel 1 send level
for the effects loop. Rotating the knob clockwise increases
the amount of signal sent to your effects unit.
F. CH.2 SEND - This knob adjusts the channel 2 send level
for the effects loop. Rotating the knob clockwise increases
the amount of signal sent to your effects unit.
G. SEND - This 1/4 inch, unbalanced, TS, output jack is
designed to send a signal to an external signal processing
device, such as a digital delay or a chorus unit.
H. LOOP - This push-push button is the on / off switch for
the effects loop circuit. When this button is pressed, the
effects loop is engaged and the gui-
tar amp’s signal is routed to your
e ffects unit. Note: Using the
footswitch overrides the loop
bypass button.
I. RETURN - This 1/4 inch, unbal-
anced, TS, input jack is designed to
accept signal from an external pro-
cessing device, such as a digital
delay or a chorus unit. The effects
loop will not operate without a plug inserted into this jack.
J. CH.1 RETURN - This knob adjusts the channel 1 return
level for the effects loop. Rotating the knob clockwise
increases the amount of signal returned to your Model T
amplifier from your effects unit.
K. CH.2 RETURN - This knob adjusts the channel 2 return
level for the effects loop. Rotating the knob clockwise
increases the amount of signal returned to your Model T
amplifier from your effects unit.
1. Adjust both channel’s front panel controls to the desired
volume and tone settings.
2. Turn all effects loop controls on the rear panel to 1.
3. Disconnect the footswitch from the amplifier and place
the channel select button on the front panel to the channel
1 setting.
4. Place the effects loop button located on the rear panel in
the Bypass position.
5. Connect your effects unit to the Model T effects loop (see
illustration above).
6. Next, engage the loop by pressing the effects loop button
in.
7. Turn the channel 1 send control clockwise until the
desired amount of signal is sent to your effects device.
Avoid very high settings of the send control as this could
clip/distort the input of your effects device.
8. Carefully adjust the channel 1 return control until the
amplifier’s volume is matched when the effects loop is
engaged or bypassed.
9. Repeat this procedure for the channel 2 effects loop.
10. Re-connect the footswitch.
IMPORTANT: 1. If your effects device is distorting or clip-
ping, reduce the send control until the distortion stops.
Next, increase the return control to match the amplifier’s
volume when the effects loop is engaged or bypassed. 2. If
you are unable to match the volume levels, make sure the
input level and/or the output level controls are set properly
on your effects device.
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