F0 00 20 0D 5A 00 = RME 12mic unit 1 (Midi 0)
F0 00 20 0D 5A 01 = RME 12mic unit 2 (Midi 1)

Then comes 30 00 (I haven't worked out what this means)

then comes the gain value (0-75db) in steps of 1db , then 04 01 = chnl 1

so it reads after F0 00 20 0D 5A 00 30 (Gain Value) Chnl 1 then Gain value chnl 2 etc up to 12 channels.
then the ID changes to unit 2 and it starts again.


chnl 1 unit 1 starting a 0db +1db up to 3db
F0 00 20 0D 5A 00 30 00 01 04 01 00 04 02 00 04 03 00 04 04 00 04 05 00 04 06 00 04 07 00 04 08 00 04 09 00 04 0A 00 04 0B 00 04 0C 00 00 0D 00 00 0E 51 01 0F 51 09 15 03 03 17 04 04 18 00 00 19 00 00 1A 03 03 30 43 00 F7
F0 00 20 0D 5A 00 30 00 02 04 01 00 04 02 00 04 03 00 04 04 00 04 05 00 04 06 00 04 07 00 04 08 00 04 09 00 04 0A 00 04 0B 00 04 0C 00 00 0D 00 00 0E 51 01 0F 51 09 15 03 03 17 04 04 18 00 00 19 00 00 1A 03 03 30 43 00 F7
F0 00 20 0D 5A 00 30 00 03 04 01 00 04 02 00 04 03 00 04 04 00 04 05 00 04 06 00 04 07 00 04 08 00 04 09 00 04 0A 00 04 0B 00 04 0C 00 00 0D 00 00 0E 51 01 0F 51 09 15 03 03 17 04 04 18 00 00 19 00 00 1A 03 03 30 43 00 F7

CHNL 2 unit 1 starting at 0db +1db up to 3db. Chnl 1 set back to 0db

F0 00 20 0D 5A 00 30 00 00 04 01 01 04 02 00 04 03 00 04 04 00 04 05 00 04 06 00 04 07 00 04 08 00 04 09 00 04 0A 00 04 0B 00 04 0C 00 00 0D 00 00 0E 51 01 0F 51 09 15 03 03 17 04 04 18 00 00 19 00 00 1A 03 03 30 43 00 F7
F0 00 20 0D 5A 00 30 00 00 04 01 02 04 02 00 04 03 00 04 04 00 04 05 00 04 06 00 04 07 00 04 08 00 04 09 00 04 0A 00 04 0B 00 04 0C 00 00 0D 00 00 0E 51 01 0F 51 09 15 03 03 17 04 04 18 00 00 19 00 00 1A 03 03 30 43 00 F7
F0 00 20 0D 5A 00 30 00 00 04 01 03 04 02 00 04 03 00 04 04 00 04 05 00 04 06 00 04 07 00 04 08 00 04 09 00 04 0A 00 04 0B 00 04 0C 00 00 0D 00 00 0E 51 01 0F 51 09 15 03 03 17 04 04 18 00 00 19 00 00 1A 03 03 30 43 00 F7