When You Switch On; Creating Your Sounds - Marshall Amplification JMP-1 Handbook

26. Master Level Selection Switch
27. Effects Return Jacks
28. Effects Level Selection Switch
29. Effects Send Jack
30. Footswitch Socket
31. MIDI OUT
32. MIDI THRU
33. MIDI IN

When you switch on

When switching on the JMP-1, the unit will run through an initialising
process and will then default to the patch number that was selected when
the JMP-1 was last switched off (Fig1). Your JMP-1 is now ready for
action.

Creating Your Sounds

Your JMP-1 is capable of producing a vast array of different tones, stored in the 100 available patches.
The simplicity of creating and storing these sounds is a major advantage and feature of the pre-amp.
A "Patch" is a combination of all the programmable elements that you put in, therefore if all tone and
volume selections are at 0, no sound will be produced. Each patch is made up of:
(A) The channel selection i.e. OD1, OD2, Clean 1, Clean 2 & Bass Shift
(B) The individual volume, gain, tone and effects levels that you have selected.
The first step is to select a patch by pressing the patch key (5) using the rotary data control (7) to reach the
desired patch number. The next stage is to "build" your required sound, firstly by selecting the channel
OD1, OD2, Clean 1 or Clean 2 with or without bass shift, then by selecting the volume, gain, tone and
effects levels. These controls work in exactly the same way as a normal Marshall amplifier, where
increasing the gain brings in more overdrive and the tone selections interact to "shape" the sound.
The JMP-1's controls are there to be used to the full and by experimenting with all the extremes you will
quickly understand it's capabilities and build your own library of sounds.
Gives +4dB or -10dB Master output level options.
Left and right jack sockets for connection from the outputs
of an external effects processor. If using a mono effects
processor the left hand return socket only should be used.
In this instance both the left and right master outputs and
speaker emulated outputs will now be working in mono.
Provides level selection of +4dB or -10dB to match the
level of external effects processors.
Output for connection to the input of the external effects
processor.
Connection point for optional Marshall four way
footswitch to give 4 patch selection.
Sends outgoing MIDI messages from the JMP-1.
Sends out MIDI messages identical to those coming in
through the MIDI IN terminal.
Terminal to receive incoming MIDI messages from
external MIDI device.
4
Fig 1 Patch
Patch Data
Patch
Store