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INTRODUCTION
The MP45 is the culmination of a great deal of effort and has performance and convenience
features that make it absolutely unique.
* Programmable Knobs
* Programmable EQ sliders with popular center freqs.
* True non-volatile memory, no batteries to replace ever.
* Three modes of operation switch selectable
* Both MIDI and pedal controllable
* Programmable gain stages
* Headphone amp
* 43 presets in standard MIDI format (including playthrough)
Safety precautions
The MP45 has very hazardous, uninsulated voltages inside the chassis. Opening the chas-
sis for any reason will void the manufacturer warranty and presents a dangerous shock
hazard. Never get it wet, if anything spills on the unit shut it off immediately and take it to the
dealer for service. Use of a surge protector is recommended to decrease chances of equip-
ment damage by voltage surges.
The Front Panel
INPUT Plug in the instrument cord here
DRIVE 1 Adjusts the gain of the first two tube stages
DRIVE 2 Adjusts the gain of the second two tube stages, only works when
the 4 stages LED is lit
MASTER This is the master volume for the tube gain stages
PRESENCE Selects overall treble tonal characteristics
SPEED Controls the sweep speed of the chorus
DEPTH Adjusts the Depth of the stereo chorus effect, when fully CCW the
chorus is disabled
OUT LEVEL Controls the overall output level of the MP45 and is not program-
mable.
HEAD PHONES This is the stereo headphone out jack
BRITE Turns on treble boost in the tube section
4 STAGES Turns on all four tube gain stages for maximum gain
80, 240, 750, 2200, 6600 These are the boost or cut equalizer frequencies and are
used for overall tone control
FX LOOP Turns on the stereo effects loop which is accessed by jacks on the
rear of the unit
GATE Turns on the automatic noise gate and need only be used for noisy
effects in the effects loop
LEARN Mode is for programming the MP45, the STORE button is active in this
mode
PLAY This is the play through mode, all the knobs and buttons are active.
RECALL Mode is for calling up stored presets. The knobs and sliders are
inactive.
STORE Puts information to the memory of the MP45 and is only active in the learn
mode
UP / DOWN Switches are for cycling through the presets - not active in the PLAY
mode
OPERATION
The MP45 has three modes of operation LEARN, PLAY and RECALL shown by an
LED next to the label.
* The LEARN mode is for storing preset information in memory. Set the
knobs and buttons for the desired sound then press the store button, the display will
blink and the knob settings are stored in the preset number on the display. Note: the
output level knob is not programmed and is for final volume adjusting, for best re-
sults this should be set at about 7 during programming. There are a total of 42
memory locations.
* In the PLAY mode the MP45 knobs work manually, the MIDI is disabled
and a footpedal can be used to turn on or off the STAGES, BRITE, FX LOOP or
GATE switches.
* The RECALL mode is for calling up stored presets, these may be ac-
cessed with the front panel UP or DOWN buttons, using a MIDI controller such as
the ROLLS MP80, or a special footswitch can be used to go up or down. The presets
are numbered as MIDI program changes 1 through 42 with change number 43 show-
ing as a 0 in the display. The 0 means the knobs are active and the MP45 is in a play
through mode on that preset. On all the other presets the knobs and sliders are
inactive since they were programmed earlier. However the buttons are still active,
even though they come up as they were programmed.
Remote control
The MP45 accepts MIDI program change information. The it may be setup to listen on any
MIDI channel or “on” for all channels or “OF” to disregard all MIDI data. The MP45 will
phantom power the MP80 footpedal and uses pin 1 for ground and pin 3 as power. In order
to use phantom power the MIDI cable must have all wires connected on the connectors. A
special dual footswitch is available that will cycle through the program numbers in RECALL
mode, or change the STAGES or FX LOOP switches in PLay mode.
Selecting a MIDI channel
The ROLLS MP45 can receive data from any of the 16 MIDI channels. The channel is pro-
grammed by holding the STORE and UP buttons in at the same time the POWER switch is
turned on, while in the LEARN mode. The number in the PROGRAM display is the current
MIDI channel number. To change the MIDI channel press the UP or DOWN buttons for the
desired channel then press the STORE button to save it, turn the MP45 off. The MIDI chan-
nel numbers go from 1 to 16 then to “on” meaning any channel then to “OF” meaning no MIDI
data is recognized. The MIDI channel will be set when the unit is turned on again.
Resetting the factory presets The original factory presets may be restored by the following
procedure. In the LEARN mode hold in the UP and DOWN buttons while turning on the
POWER. An “FP” will show for a moment in the display then the number “1”. The MP45 may
now be reprogrammed or switched to another mode for use.