User Manual

15
MIDI and the Mod Rex
The Mod Rex accepts MIDI input from the standard 5-Pin MIDI IN jack on the top of the
unit. MIDI can be used for three primary purposes, to tempo sync the modulation rate
with an external device (via MIDI Real Time messages), to recall presets (via MIDI
Program Change messages), and to control any parameter on the Mod Rex (via Control
Change messages). The Mod Rex does not transmit any MIDI output.
MIDI TEMPO SYNC
To sync the Mod Rex with an external device via MIDI, plug a cable into the MIDI IN jack
on the Mod Rex from the MIDI Out jack/cable on an external device. It is up to the
external device to create and send all MIDI Real Time messages. Past connecting the
devices properly, no extra steps on the Mod Rex are required for MIDI tempo syncing to
work properly. The Mod Rex’s MIDI channel does not affect MIDI Real Time messages.
The only MIDI Real Time commands besides MIDI Clock that the Mod Rex reacts to are
MIDI Start and MIDI Continue. Upon receiving either command, all LFOs are hard reset.
This is done to line up the beginning of a measure with the start of a song.
MIDI PROGRAM AND CONTROL CHANGE MESSAGES
The Mod Rex can receive MIDI messages from an external device to select presets and
control nearly every parameter. In order for these MIDI messages to be properly
understood, the Mod Rex’s MIDI channel (from 1 to 16) must match the MIDI channel
assignment in the outgoing messages from the external device.
To set the Mod Rex’s MIDI channel, hold down the PAN DIVISION knob until all three
LEDs to the left of the display light, and the screen reads a number from 1 to 16, with a
dash on each side. Rotate the PAN DIVISION knob to set the MIDI channel.
Program change messages can be sent to recall presets 1 through 100.
Refer to the chart on the following page to see how Control Change messages are
mapped to the Mod Rex.
MIDI control data values range from 0 to 127. In the case of the seven parameters that
are controlled by fluid knobs on the Mod Rex, plus Expression control, MIDI levels 0
through 127 are mapped to the full range of the physical knob. In the case of
parameters, such as a modulation’s division or shape/type that has set values/options,
the first few MIDI data values correspond to that parameter’s options (so in the case of
a division, 0-9, in the case of a shape, 0-3 represents the four shape options) and any
MIDI data value greater than the maximum value will result in the highest option. So
giving a modulation’s division a parameter of 58 will result in it being set to 9, etc.