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  1. Josie
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  3. Saturday, 22 September 2018
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Hello. My name is Josie Hill and I've been involved in MIDI since the mid 1980s when I wondered what those sockets were on the back of of my Roland JX3P. Roland Japan would not supply me the format of the MIDI memory map dump from a Roland TR707 drum machine because they opined it would be too hard for me to understand! However, I managed to reverse engineer it.

Now, 30 years on, I have a similar problem with the first version 1.1 Fender Cyber Twin PS-393. Can anyone please supply me with the format of the 55 byte data block per preset?
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So my interpretation, so far, of the SYSEX dump data:
00007D8C 1 -- F0 Buffer: 6 Bytes System Exclusive
SYSX: F0 08 21 11 02 F7
00007E76 1 -- F0 Buffer: 55 Bytes System Exclusive
SYSX: F0 08 21 11 02 00 01 2A 00 43 68 61 6D 70 20 27 00 34
SYSX: 39 20 20 20 20 20 05 20 20 24 0C 40 42 71 0B 40 7F 7C
SYSX: 48 28 73 68 00 00 00 7F 7F 7F 7F 00 00 00 00 00 00 01
SYSX: F7
00007EC4 1 -- F0 Buffer: 7 Bytes System Exclusive
SYSX: F0 08 21 11 02 7B F7


is:

File start: {F0 08 21 11 02 F7}
Data header: {F0 08(<- start of checksum) 21 11 02 00}
Data Checksum: OK
Data trailer: F7
File end: {F0 08 21 11 02 7B F7}
Interpretation
Display Name: A00 Champ '49
FirstBitPackWord: 240C: [0010010000001100]
bits unknown: {14, 15}
Tone Stack Type: Tweed
Tone Stack Position: Pre-Distortion
Drive Circuitry: Tweed Tube1
Reverb Type: Small Ambience
Timbre: None
Gain: 8.1
Volume: 5.4
Treble: 2.4
Middle: 9.6
Bass: 9.2
Presence: 1.0
Reverb: 1.0

regards
Josie
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