RFX MP128
Owner's Manual

INTRODUCTION Thank you for purchasing the RFX MP128 MIDIBUDDY. The MP128 is a controller for sending MIDI program change information on any of the 16 standard MIDI channels. This is done in 10's and 1's, or it can be thought of as 12 banks of 10. The 3-digit display shows the MIDI program number. The MP128 is a simple device to use, extending the flexibility of any MIDI controlled device. To understand the unit better please read and refer to the rest of this manual. DESCRIPTION

The LED display on the MIDIBUDDY shows the MIDI program number (0 - 127, or 1 - 128 depending on the setting of DIP switch # 6). As the 10s Up or Down are scrolled through, the unit increments or decrements through banks 10 through 120. The ones digit is selected by switches 0 - 9. MIDI data is sent only when a 1 9 button is selected except as described below. The display will show a "-" in the right hand digit when no MIDI information is sent. Buttons on the pedal are labeled 10's UP 10's DOWN and 0 - 9. Pressing a , numbered button causes a MIDI program change message to be sent. The selected program number is displayed in the window's right hand digit. Pressing the UP or DOWN buttons moves you into the next higher or lower group of 10 presets. The display will show a "-" in the right hand digit if the program change number isn't between 1 and 128 (there is no 00 or 129) or when a 10's UP or DOWN button is pressed.

A. Program Select, Function buttons B. Program/Function Display Window C: 127/128 (Dip switch #6) Switch D: PROGRAM CHANGE/SONG SELECT (DIP switch # 5) Switch E: MIDI CHANNEL SELECT Switches (DIP switches 4,3,2, and 1) F: SHARE Output G: MIDI OUTput jack H: POWER jack INSTALLATION Apply power (7 - 15 volts AC or DC) to the Power jack on the rear of the MP128. Or, the MP128 may be phantom powered through the MIDI jack. While there is no standard for MIDI phantom power, there is a convention of pin 1 as ground and pin 3 as hot. The MIDIBUDDY may be phantom powered by applying 7 - 15 volts DC to those pins. Contact ROLLS Corp. for further information regarding powering this product via phantom power. Connect the MIDI OUT of the MP128 using a standard MIDI cable, to the MIDI IN on the unit to be controlled. It may be used on the floor and foot switched or placed on top of a keyboard for easy hand access. The unit, with slight modification, will fit in a standard 19 inch audio rack if necessary. The "SHARE" jack is in parallel with the OUT jack and operates as a MIDI "Thru" for connecting several devices together. For example, two MP128s operating on different MIDI channels could use the same MIDI path. OPERATION The MP128 follows MIDI standard protocol and will work with any MIDI controllable device. Make sure the MIDI channel numbers match so both units are "talking" on the same channel. Many MIDI devices have an "omni" or all-channel mode, this may be used to avoid confusion in selecting a channel on the MP128.

MIDI Start and Stop Commands When "00" is pressed, the MP128 display shows an "ST" (which looks more like an Sr), and sends a MIDI start command. This may be used to start a MIDI sequencer. When program "129" is selected, an "SP" is displayed and a MIDI Stop command is sent. Setting the DIP Switches The MIDI Channel is set with DIP switches 1 - 4 on the rear of the MP128. in binary coding. If all switches are in the off position, MIDI channel 1 is selected, if all are on, MIDI channel 16 is selected. Use the following chart to select the MIDI Channel. CH# ON OFF CH# ON OFF 1 1,2,3,4 9 4 1,2,3 2 1 2,3,4 10 1,4 2,3 3 2 1,3,4 11 2,4 1,3 4 1,2 3,4 12 1,2,4 3 5 3 1,2,4 13 3,4 1,2 6 1,3 2,4 14 1,3,4 2 7 2,3 1,4 15 2,3,4 1 8 1,2,3 4 16 1,2,3,4 � Switch #5 selects whether the MP128 transmits Program Change information only, or transmits Program Change and Song Pointer. � Since some MIDI devices display their programs as 0 - 127, and others display 1 - 128, the MIDIBUDDY's DIP switch #6 will select either of these two. If switch #6 is in the off (up) position, the MP128 will display program numbers 0 - 127. If switch #6 is on (down), the MP128 will display program numbers 1 - 128 (which is the way the MP128 comes from the factory).