I haven't got a musical hair on my head and I know very little about OctaMed, but my daughter has the v5 manual. Here's what it says about those five digits after the note.
The first digit is the Instrument Number, which I guess you know. The next numbers are in pairs and are hexadecimal. They are called 'Player Commands'. The first pair is the 'Command Type' and the last pair is the 'Command Level'.
The first digit in the Command Level pair is called 'Level 1'. The second digit is 'Level 2'. When entering commands, you can set the Level 1 to '1' by holding down the Alt key while entering the Level 2 value in the Level 2 field.
Player commands can be split into 'Normal' commands and 'Midi' commands.
Here's a list of Command Types and their Command Level 1 and 2 effects:
00 Arpeggio 1 First Pitch 2 Second Pitch
01 Pitch Up Slide speed
02 Pitch Down Slide speed
03 Portamento Pitch slide speed
04 Vibrato 1 speed 2 depth
05 Slide Pitch and Fade fade speed
06 Vibrato and Fade fade speed
07 Tremolo 1 speed 2 depth
08 Hold and Decay 1 decay 2 hold
09 Secondary Tempo tempo value
0A Volume Slide speed
0B Playing Sequence Position Jump Position to jump to - 1
0C Set Volume default level
0DVolume Slide speed
0E Synth Jump waveform sequence line number
0F Primary Tempo/Miscellaneous (lots of these) various
11 & 12 Slide pitch up and down once speed
13 Missing?
14 Protracter style vibrato 1 speed 2 depth
15 Set Finetune finetune vlue (signed hex)
16 Loop number of times (00=start)
17 Missing?
18 Cut note number of ticks
19 Sample start offset starting byte - 256
1A and 1B Slide volume Up/Down Once speed
1D Jump to next playing sequence entry start line number
1E Replay line number of times
1F Note delay and Retrigger 1 delay 2 retrig
For MIDI use, some of the above commands have different effects:
05 and 00 Controller Number and Controller Value
01 and 02 Pitchblender Up/Down speed
03 and 13 Set Pitchblender value (signed hex)
04 Modiulation Wheel level ($00 - $7F)
08 Set Hold Key 1 unused 2 hold
0A Polyphonic Aftertouch level ($00 - $7F)
0C Set Volume
0D Channel Pressure level ($00 - $7F)
0E Pan Control value ($00 - $7F)
10 Send MIDI message Message number - 1
1C Change MIDI preset New preset number
Hope this means something!
Manual is 200+ pages so there's a lot to know!
Cheers, JaX