STORE toggle located on the right side of the Rear Panel. That Channel and its selected EQ status will now come up in the Midi
Program number you just stored information under. Or, if you’re using the JP-2C Footswitch, you can simply toggle on or off either of
the EQs at any time. Regardless of how the EQs are activated, the EQ Status LEDs will be on (illuminated) whenever its adjoining
EQ is active and in the signal path.
When using the JP-2C Footswitch or the Channel EQ SELECT mini toggles to control the EQs, you will notice that whichever way
you trigger the EQs, (EQ SELECT mini toggle in the Channels or the JP-2C Footswitch), the current one being used overrides the
other. In other words, if you turn one of the EQs on with the mini toggle in say Channel 1, you can turn it OFF with the Footswitch. And
conversely, if you turn one of the EQs off with the Footswitch, you can turn it back ON with the EQ SELECT mini toggle in the Channel.
Once Channel/EQ combinations are stored under a Midi Program Number, the EQ status must be reset with the Channel EQ SELECT
mini toggle by turning it first to OFF and then selecting the EQ you want (EQ 1 or EQ 2) back ON in that Channel. However, unless
new information is stored by toggling the STORE mini toggle on the Rear Panel, the next time that same Midi Program Number is
called up, the original previously STORED Channel/EQ combination will be called up again. The MESA JP-2C Footswitch will not
override Midi commands sent via a Midi controller. NOTE: DO NOT connect both the JP-2C Footswitch and a Midi Footcontroller to
their dedicated (7-Pin and 5-Pin) DIN jacks at the same time.
LOOP SELECT: FX/MD
This toggle, while housed in the EQ Window, has nothing to do with the Graphic Equalizers. It is the
LOOP SELECT switch and it controls the status of the Effects Loop and its associated SEND and RETURN jacks on the Rear Panel.
The Effects Loop is wired in Series with the main dry signal, with the SEND signal coming from the preamp and the RETURN signal
feeding a buffered stage directly in front of the power section. The Effects loop is buffered to aid in preventing signal
loss from mismatches in Input / Output impedance with processors and also to prevent compromised sound with
longer cable lengths, however it is still advisable to use the shortest lengths of the highest quality cable possible
when interfacing processors to the JP-2C.
The two ways to engage the Effects Loop are as follows; FX (switch up) engages the Loop and it will remain on
all the time, unless a Midi Program Change message is sent. In that case, whatever has been stored for an individual Channel, will
determine the status of the Effects Loop. MD (switch down) BYPASSES the Effects Loop all the time regardless of Channel selected
with the Front Panel Channel Select switch or the JP-2C Footswitch, and provides the necessary “reset” conditions in the switching
buss for storing the Loop status under Midi Program locations. To Store the Effects Loop under a specific Midi Program number,
simply turn the Loop Off (switch down) with the Front Panel LOOP SELECT, select the desired Channel you wish to call up under a
specific Midi Program number location, switch the LOOP SELECT mini toggle to FX (Loop On) and toggle the Rear Panel STORE
switch. Every time you return to that Midi Program number, the Effects Loop will be activated. The Yellow Loop Status LED indicates
when the Effects Loop is ON and in the signal path regardless of how it is engaged.
REVERB/MD/FS
This toggle determines whether the rich tube REVERB circuit is in the mix. While each Channel has a dedicated
REVERB MIX control located on the Rear Panel, these do nothing until the REVERB circuitry is activated by this Front Panel toggle
switch. The two choices here on the Front Panel are REVERB (switch up), which engages the circuit and allows an individual blend
of the REVERB in each Channel, or MD/FS (switch down), which both BYPASSES the REVERB and also allows
instant engagement of it from the JP-2C Footswitch. As with the EQs, the Green REVERB Status LED follows the
status of the REVERB circuit and will be illuminated whenever the REVERB is in the signal path.
As with most of the other Front Panel mini toggles on the JP-2C, the MD/FS position provides a “reset” condition
from which the processor used in the switching buss can write and respond to Midi Program Change information. Unlike the individual
EQs, the REVERB is stored as a global setting, circuit-wise. There remains the ability to have separate REVERB MIX settings for
the Channels, but the circuit status is stored as a global condition (in the signal path all the time or bypassed in all the Channels).
As with the EQs, the current mode of activation (Front Panel REVERB toggle or JP-2C Footswitch REVERB button), overrides the
position/status of the other. So if you turn the REVERB Circuit ON with the Front Panel mini toggle, you can turn it off with the JP-2C
Footswitch, or trigger it ON from the JP-2C Footswitch, you can turn it OFF with the Front Panel mini toggle. The Green REVERB
LED will follow the status of the REVERB regardless of how you trigger it.
80Hz 240 750 2200 6600 80Hz 240 750 2200 6600
FX
MD
CH 1
FS
MD
EQ 2
2
CH 3
SHRED 2
MD
SRD 2+3
REV
MD/FS
EQ
1
EQ 2
80Hz 240 750 2200 6600 80Hz 240 750 2200 6600
EQ 1
FX
MD
CH 1
FS
MD
EQ 2
2
CH 3
SHRED 2
MD
SRD 2+3
REV
MD/FS
PAGE 15
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