THIS IS NOT AN OFFICIAL RELEASE OF MIDI2ESF, I'M UPLOADING THIS ONLY IN CASE
SOMEBODY REALLY NEEDS IT RIGHT NOW. Currently midi2esf is unfinished, and it
isn't guaranteed to work properly with all MIDIs. You have been warned.

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What's implemented:

   - Note on, note off :P
   - Volume changes
   - Instrument changes
   - Initial tempo
   
   - FM channels, square wave PSG channels, standalone PSG4 channel,
     PCM channel (mapped to percussion)

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Some rules:

   - Each MIDI channel must be mapped to only one Echo channel (yes, the
     MIDI channels, not the tracks). This also implies no polyphony, if you
     need that then play notes in separate channels.
   
   - Yes, multiple MIDI channels may be assigned to the same Echo channel,
     just don't get both playing notes at the same time (this is useful
     mainly to use multiple instruments in the same channel, since changing
     instruments in the middle of a track seems to be painful with several
     MIDI editors).
   
   - The same MIDI instrument can be mapped to a different Echo instrument
     for both FM and PSG. This means you can use the same MIDI instrument on
     both kinds of channels if you wish.

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There are three things that I know that don't work right now:

   - PSG3+PSG4 mode (incomplete, stand-alone PSG4 works though)
   - Pitch slide (may work, but I didn't test it yet...)
   - Mid-tune tempo changes (not implemented yet)

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midi2esf works with a batch file, similar to how mdtiler works. I'd suggest
go check mdtiler to get an idea of how to use it meanwhile. Call midi2esf as
follows:

   midi2esf «batch-file»

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Quick list of commands (square brackets means it's optional), you figure out
what they do for now though it should be self-explanatory:

   instrument fm «midi-instr» «echo-instr» [transpose «semitones»]
   instrument psg «midi-instr» «echo-instr» [transpose «semitones»]
   instrument pcm «midi-note» «echo-instr»
   channel «midi-chan» «echo-chan»
   convert «input-file» «output-file»
   loop off
   loop on
   reset instruments
   reset channels

«midi-instr» is a number between 1 and 128.

«echo-instr» is a number between 0 and 255.

«midi-note» is a number between 0 and 127 (it's in semitones, so every 12 is
a different octave). C-5 is 60, for reference.

«midi-chan» may be a number from 1 to 16. You can't reassign MIDI channel #10
(percussion) though, since it's always mapped to Echo's PCM channel.

«echo-chan» may be fm1, fm2, fm3, fm4, fm5, fm6, psg1, psg2, psg3 or psg4.
(there's psg3+psg4 too, but it isn't fully implemented yet)