position the red LED turns green and all the outputs are active
-15dB: In the down position this toggle switch attenuates the input signal by 15dB, for use with
active basses or instruments with very high output levels
Overdrive Section
In the overdrive section the instrument signal input level is set by the Pre Gain control and then split
into 6 frequency bands covering the entire audio spectrum Each band goes through a separate
overdrive channel with individual Drive and Level controls Then all the overdrive channels are
summed back together into one signal It's important to note that the overdrive channels are divided
by frequency on the input signal and the overdrive on each channel will be applied mostly to that
particular frequency band The harmonics generated on each overdrive channel will go beyond that
frequency band and are retained as an integral part of the output tone
Pre Gain: This sets how much of the clean instrument signal is sent in parallel to all the individual
drive channels
Drive Channels: Each drive channel has a Drive control which sets how much overdrive is applied
and a Level control which sets the volume of that channel in the overall output of the Overdrive
section
The Low channel covers the bass end of the audio spectrum
The four mid range channels are centered on 190Hz, 250Hz, 400Hz and 620Hz
The High channel covers the treble end of the audio spectrum
Treble: The treble controls works on the output mix of all those channels to tame the possibly huge
amounts of harmonics generated by summing all the overdrives together
ffects Loop
The effects loop can be set to come before or after the overdrive section or turned off entirely using
the rotary switch labeled POST, OFF, PRE The red LED indicates when the Effects Loop is in use
either Pre or Post Overdrive The Send and Return jacks are on the back panel
In the Pre position the instrument signal is sent through the FX Send level control to the effects loop
send The effects loop return is then sent directly to the overdrive section and finally to the OD+FX
Volume control
In the Post position the output of the overdrive section is sent directly to the FX Send level control
and then to the effects loop send The effects loop return is then sent to the OD+FX Volume control
In the Off position the effects loop is not in the signal path The overdrive section output is sent
directly to the OD+FX Volume control
FX Send: The level of signal sent to the effects loop can be adjusted with this control With the
effects loop set to PRE and the FX Send set to noon the level sent to the effects loop will be identical
to the instrument signal input When the effects loop is set to POST the send comes from the output
of the overdrive section and the signal level may need to be adjusted with the FX Send control
OD+FX Volume: This control sets the output level of the Overdrive section and the Effects Loop
sent to the Master section
