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Basically you have to understand the language itself, and manually decipher each command. As you know, Famitracker regroups volume, arp, pitch and duty all into a single container called an 'instrument'; MML keeps those things independent from each other, as there is no 'instrument' command per se.
[url=http://www.shauninman.com/assets/downloads/ppmck_guide.html]This is the reference I used when I first tried to learn the MML language. It's been pretty useful, but now you even have the luxury of having tonnes of [url=http://www.mmlshare.com/tracks/]great examples available online for reference.
Basically, here are the most frequently found commands for 2a03 (as well as other chips), other than the notes themselves of course:
@# = static duty cycle (the values correspond to Vxx in FT, i.e. @0 = V00, etc.)
@@# = calls a predefined duty cycle envelope (look for it in the macro definition section, usually below the header). Duty envelopes are defined using @#, but are called within a track using @@#.
v## = static volume
@v## = calls a predefined volume envelope (again, look below the header)
D## = detune (works differently than Pxx: D1 = P81 and D-1 = P7F).
EN## = calls a predefined arp macro. Arp macros are relative, rather than absolute (like they are in FT), so be wary.
ENOF = stops a previously activated arp macrp
EP## = calls a pitch macro.
EPOF = stops pitch macros
MP## = calls a vibrato macro.
MPOF = stops a previously activated vibrato macro.
Let me know if you have further questions!
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