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standard MMC says, as long ago and previously mentioned:
F0 7F xx 06 04 F7 = MMC FFWD (fast forward)
F0 7F xx 06 05 F7 = MMC REW (rewind)
nb. qtractor implements it as toggles, as if good old tape recorder buttons were about :)

re. SPP. START/STOP, no those aren't sysex.

why don't just read the MMA standard? no offence, but these are pretty universal, late 80s MIDI 1.0 system common/real-time messages--your device vendor should know that better :)

hth.
cheers