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4
OD1
10
0
10
0
10
S
MIDDLE
TREBLE
OD2
10
0
10
0
10
S
MIDDLE
TREBLE
5
10
0
10
0
ASS
VOLUME
RVB
CRUNCH
10
0
10
0
ASS
VOLUME
RVB CLEAN
stack (i.e. the tone network lies before the
channel's main gain stage). The reverse (i.e.
the tone network being after the main gain
stage) is typical of most Marshall amplifiers
and, as a result, the CLEAN channel's tone
controls work in a slightly different way than
you might expect; in addition to controlling
the tone of the channel they also affect how
it reacts in terms of gain, allowing you to
shape how the signal distorts.
For example, turning up the MIDDLE
control on higher GAIN settings will focus
the distortion there, making your sound
'sing' in a traditional blues/rock way. Also,
OD1
MODE
0
10
0
10
GAIN
VOLUME
(Orange & Red)
OD2
MODE
0
10
0
10
GAIN
VOLUME
6
8
REVERB
MASTER
10
0
10
0
10
RVB
PRESENCE
OD2
REVERB
MASTER
10
0
10
0
10
RVB OD1
MASTER 1
7
2
CLEAN
0
10
0
10
0
BASS
MIDDLE
TREBLE
CRUNCH
0
10
0
10
0
BASS
MIDDLE
TREBLE
3
9
FX LOOP
0
10
RESONANCE
FOOTSWITCH/
MIDI PROGRAM
0
10
MASTER 2
10
because of the channels' 'tone then gain'
topology, when a lot of GAIN is dialled in
(especially in the case of the red mode), it
may appear that its tone controls aren't
doing as much as you'd expect or sound
over distorted. This is because the signal
is being distorted after the tone stage,
minimising the effectiveness of the BASS,
MIDDLE and TREBLE controls.
3. CRUNCH CHANNEL
At this point JVM4 reverts to the
more typical Marshall preamp circuit
characteristic of 'gain then tone'. This is
also true of the OD1 and OD2 channels.
ENGLISH
CLEAN
MODE
10
0
10
GAIN
INPUT
CRUNCH
MODE
10
0
10
GAIN
1
OFF
ON
STANDBY
/ SILENT RECORDING
11
O
I
POWER
12
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