I'm trying to figure out how to use the "-Z" (or "--freq_table") option of
timidity to assign specific frequencies to midi note numbers, but there is no clear documentation online.]
How do I specify a frequency table for timidity?
The file is a list of 128 integers -- each of which is the frequency of the corresponding midi note in miliHertz. The first line gives the frequency for midi note 0, the next for midi note 1 and so on.
For A440, 12-tone equal temperament, lines 65-72 (inclusive) would be:
--lines 1-64 (midi notes 0-63) snipped >> # next is midi 64 329628 349228 369994 391995 415305 # next is midi 69 440000 466164 493883 -- lines 73-128 (midi notes 72-127) snipped >>
The file can contain comment lines that start with a
# character; note that placing a comment after an entry will cause problems, i.e.
414305 440000 # a comment like this will cause problems 466164
I think that putting comments after the entry causes the whole line to be ignored but I haven't tested this.
The following python snippet spits the file for A440, 12TET:
f0=440.0 midi0=69 print "# A440 12-TET" for i in xrange(128): print int( f0*2.0**( (i-midi0)/12.0 )*1000+0.5 )
To have octave repetition of the same table do something like
table=[1.0, 16.0/15, 9.0/8, 6.0/5, 5.0/4, 4.0/3, 45.0/32, 3.0/2, 8.0/5, 5.0/3, 16.0/9, 15.0/8] f0=440.0 midi0=69 print "# A440 just intonation" for i in xrange(128): (octave, index)=divmod( i-midi0, len(table) ) print int( 2**octave*table[index]*f0*1000+0.5)