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Here is the common part, along with descriptions of each byte’s purpose:
F0 - Start of Sysex [SOX]
00
00
1B - Peavey Manufacturer ID = 00 00 1B
11 - BAM Product ID (10 for PFC4B commands: CMD = 00, 01)
00 - Reserved for future use (keep fixed at zero)
CMD - Command byte that defines which Sysex message it is
<data> - Optional data
F7 - End of Sysex [EOX]
NOTE: Each time a preset is recalled, it is first loaded into a RAM buffer that we call the Edit Buffer
(could also be called “current preset”). If another preset is recalled, the Edit Buffer is erased, so any
changes will be lost unless stored to a User location (or externally). In the table below, we refer to
this preset location as the “EdBuf.”
Now for the unique stuff:
CMD Number (in HEX) / <data> description Resulting Action
Name
00 / PFC4B Online None Amp sends PFC4B setup data
01 / PFC4B Switch Press Footswitch #, 0-5 Amp responds based on mode
02 / Version Request None Amp sends message 03
03 / Version of Software Version #, 00-7F Amp ignores if received
04 / Send Presets None Amp sends message 05
05 / Receive Presets Preset data, nibblized * Amp saves presets in User slots
06 / Send Single Preset Preset # (00 - 0F) Amp sends message 09 ****
07 / Receive Single Preset Preset #, preset nibs * Amp saves preset to User slot
08 / Send EdBuf None Amp sends message 09
09 / Receive EdBuf Preset nibbles * Amp loads and activates EdBuf
0A / Store EdBuf Preset # (00-0F; 7F for current) Amp stores EdBuf to User preset
0B / Send EdBuf Byte EdBuf address (00 - 1E) Amp sends message 0C
0C / Receive EdBuf Byte EdBuf address, value nibs * Amp activates EdBuf parameter
0D / Send EdBuf Partial Byte Partial address ** Amp sends message 0E
0E / Receive EdBuf Partial Byte Partial address, partial value ** Amp activates EdBuf parameter
0F / Send EdBuf Current Primary address *** Amp sends message 10
10 / Receive EdBuf Current Primary address, current value *** Amp activates EdBuf parameter
11 / <reserved>
12 / Send Globals None Amp sends message 13
13 / Receive Globals 14 Global Bytes, nibblized * Amp saves and activates globals
14 / Send Global Partial Byte Partial address, 00-0D ** Amp sends message 15
15 / Receive Global Partial Byte Partial address, partial value ** Saves and activates global in amp
* Nibblized data is sent hi nibble, then low nibble. E.g. a hex byte value of 74 will be sent as two bytes: 07
and 04. This is because MIDI data bytes really only have 7 bits - the most significant is reserved to be set for
status bytes only.