As far as I can tell (using Google) Serato Inc LP is a piece of software.
Maybe the piece of the format specification quoted does not apply in the same way as it would to a fixed midi instrument?
No, I think it should apply - otherwise why MIDI would assign Serato Inc LP a System Exclusive Manufacturer ID?
The trace file attached to
Wireshark bugzilla contains following Serato Inc LP SysEx commands:
f0 00 20 7f 01 02 01 01 3b 09 0a 0c 0f 02 03 0f 0a 0e 0e 0d 0c 02 08 0b 01 f7
to which the device did reply:
f0 00 20 7f 01 02 01 02 3b 0d 0d 00 03 01 03 03 0d 0e 07 08 02 07 05 0b 0f f7
and then the commands without a reply:
f0 00 20 7f 03 01 f7
f0 00 20 7f 02 02 08 00 00 00 00 00 f7
f0 00 20 7f 03 03 08 00 00 00 00 00 00 00 f7
f0 00 20 7f 01 04 08 00 00 00 00 00 00 00 f7
f0 00 20 7f 03 04 08 00 00 00 00 00 00 00 f7
f0 00 20 7f 02 04 08 00 00 00 00 00 00 00 f7
f0 00 20 7f 03 02 08 00 00 00 00 00 f7
f0 00 20 7f 01 01 00 00 00 00 00 00 f7
f0 00 20 7f 03 01 00 00 00 00 00 00 f7
and so on...
Only the "f0 00 20 7f" ... "f7" is specified by MIDI 1.0 Detailed Specification. All bytes in between are up to Serato Inc LP, which should have published the format somewhere - I don't know where or if they did publish it at all.