Remove old leftover MML comments

Re #273

smw_music/data/mml.txt

@@ -84,28 +84,23 @@ w${song.volume}
     unpitched_sz = max(list(len(unpitched_defn(k)) for k, v in inst_samples.items() if v.percussion), default=0)
 %>\
 ; Instrument voice definitions
-; Only change the instrument octave numbers on the right of the equals signs
 %for name, sample in inst_samples.items():
 "${f'{voice(name):{voice_sz}}'} = ${f'{sample.instrument_idx:3} o{sample.default_octave}'}"
 %endfor
 
 ; Instrument dynamics definitions
 ; Yes, this is ugly.  But it lets you tie dynamic levels to instruments and
-; crescendos. Only change the hex (00-FF) volumes right after each equals sign.
+; crescendos.
 %for name, sample in inst_samples.items():
 "${f'{dyn(name):{dyn_sz}}'} = ${dyn_str(sample)}"
 %endfor
 
 ; Instrument articulation definitions
-; Just like dynamics, only touch numbers after the 'q' after each equals sign.
 %for name, sample in inst_samples.items():
 "${f'{artic(name):{artic_sz}}'} = ${artic_str(sample)}"
 %endfor
 
 ; Instrument pan definitions
-; Set these to PAN_LEFT, PAN_MID_LEFT, PAN_CENTER, PAN_MID_RIGHT, PAN_RIGHT, or
-; pick your own using a y command.  These are blank by default because not
-; everyone uses them and it ; saves space to leave them out.
 %for name, sample in inst_samples.items():
 "${f'{pan(name):{pan_sz}} = {pan_str(sample)}'}"
 %endfor
@@ -153,11 +148,6 @@ ${f'"v{str(dyn): <4} = $E7$_{dyn} \\"vCUR = v{dyn}\\""'}
 "GLOBAL_LEGATO = $F4$02"
 "CRESC         = $E8"
 "DIM           = $E8"
-"PAN_LEFT      = y20"
-"PAN_MID_LEFT  = y12"
-"PAN_CENTER    = y10"
-"PAN_MID_RIGHT = y08"
-"PAN_RIGHT     = y00"
 "VIB_OFF       = $DF"
 %for n, channel in enumerate(channels):