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124 Omni Off (0)
125 Omni On (0)
126 Mono On (0-16; 0=Omni Off)
127 Poly On (0)
6.3B Mode Messages
There are two messages that determine the MIDI mode (i.e., how the D4 will receive
MIDI data). The “Omni” message determines how many channels will be recognized.
Omni On means that data from all channels will be received; Omni Off limits the
number of channels, usually to one.
The “Mono/Poly” message deals with voice assignment within the synthesizer. In
Mono mode, only one note at a time plays in response to voice messages; in Poly
mode, as many voices can play notes as are available to play notes.
The D4 implements two different MIDI modes.
Omni On/Poly (Mode 1) The D4 responds to MIDI data occuring on any channel.
Omni Off/Poly (Mode 3) The D4 is tuned to a single MIDI channel, from 1 to 16.
6.4 SYSTEM COMMON MESSAGES
Intended for all units in a system, some of these messages are:
Song Position Pointer This indicates how many “MIDI beats” (normally a 16th note)
have elapsed since a piece started (up to 16,384 total beats). It is primarily used to
allow different sequencers and drum machines to auto-locate to each other so that if
you start one sequencer, the other device will automatically jump to the same place
in the song, whereupon both continue on together.
System Exclusive This message (called sys ex for short) is considered “exclusive”
because different manufacturers send and receive data over MIDI which is intended
only for that manufacturer’s equipment. Example: Sending a D4 message to an
Ensoniq SD-1 won’t do anything but the message will be understood by other D4s.
This data often contains information about individual instrument programs.
Timing Clock A master tempo source (such as a sequencer) emits 24 timing
messages (clocks) per quarter note. Each device synchronized to the sequencer
advances by 1/24th of a quarter note when it receives the clock message, thus
keeping units in sync after they’ve both started at the same time. Many devices
subdivide this clock signal internally for higher resolution (e.g., 96 pulses per quarter
note).
Start Signals all rhythmically-based units when to start playing.
Stop Signals all rhythmically-based units when to stop playing.