Peavey DPM V3 Owner's Manual page 81

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7.6 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 Peavey DPM V3
message to an Ensoniq EPS won't do anything, but will be understood by other
DPM V3s. This data often contains information about individual instrument patches;
some sequencers can record sys ex data in á track, then send it out to re-configure
an instrument's patch settings.
Timing Clock The master tempo source (such as a sequencer) emits 24 timing
messages per quarter note. Each device synchronized to the sequencer advances by
Ye4 of a quarter note when it receives the clock message, thus keeping units in sync
after they've both started at the same time.
Start Signals all rhythmically-based units when to start playing.
Stop Signals all rhythmically-based units when to stop playing.
Continue Unlike a Start command, which re-staris a sequencer or drum machine from
the beginning of a song each time it occurs, sending a continue message after stop
will re-start units from where they were stopped.
7.7 BOOKS ON MIDI
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