Am Donnerstag, 14. Juni 2007 16:39 schrieb Don Simons: > I've just realized that there is a way to allow MIDI 128th notes without > PMX completely choking. But the resulting MIDI file will be flawed. The > fundamental quantum of MIDI time is a "MIDI tic" which PMX defines once and > for all as 1/15 of a 64th note or 1/120 or a quarter note. Since that makes > a 128th note equal to 7.5 tics, which is not an integer, there's a problem > right away. But that's not the reason PMX was choking. Rather, it's because > PMX puts in a fixed-length gap at the end of every note, subtracting the > gap from the length of the note. The default is 10 tics, which is 2/3 of a > 64th, but longer than a 128th, so the logic was breaking down. You can > forestall the locigal problem by shortening the gap to something less than > 7.5. The command is e.g. Ig5 . With that the code will run. But for one > thing, you're stuck with that tinier gap at the end of every note. (I > haven't tested whether you can change it on the fly.) And for another > thing, a flaw now comes about because a 128th cannot be represented > exactly. As things now stand, PMX will always round 7.5 in the same > direction. So if there are more 128ths in one voice than the others, they > will get out of phase. Here's an example where you can hear that things get > out of whack at the end: >
Hi Don, Ig5 solves my problem, thanks for your reply Hermann > ===================================== > 2 2 2 4 2 4 0 0 > 1 5 20 0 > > > bt > .\ > Ig5 > b43 d / > g84d g1x8 a b c d c b a g84d g1x8 a b c d c b a / > b43 d / > g84d g1x8 a b c d c b a g84d g1x8 a b c d c b a / > b43 d / > g84d g1x8 a b c d c b a g84d g1x8 a b c d c b a / > b43 d / > g84d g1x8 a b c d c b a g84d g1x8 a b c d c b a / > d24 d d d / > f24 f f f / > ====================================== > > If there were the same number of 128th in each voice, then they would come > back together: > > ====================================== > 2 2 2 4 2 4 0 0 > 1 5 20 0 > > > bt > .\ > Ig5 > b43 d / > g84d g1x8 a b c d c b a g84d g1x8 a b c d c b a / > b43 d / > g84d g1x8 a b c d c b a g84d g1x8 a b c d c b a / > g84d g1x8 a b c d c b a g84d g1x8 a b c d c b a / > b43 d / > g84d g1x8 a b c d c b a g84d g1x8 a b c d c b a / > b43 d / > d24 d d d / > f24 f f f / > ======================================= > > At this point someone might be wondering if the quantum problem comes up in > more mundane situations with xtuplets, and the answer is well, sort of, > depending on your definition of mundane. Since a quarter note is 120 tics, > you can divide it evenly by 2,3,4,5, or 6, but not 7. I anticipated this > one, and tried to build special logic for just that case (quarter-note > septuplets) to keep them lined up. If that works the way it should, you > won't get the quantum disconnect until you divide a quarter by 9. That one > will not be fixed. > > --Don Simons > > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] Behalf Of Hermann > > Hinsch > > Sent: Wednesday, June 13, 2007 11:12 AM > > To: Werner Icking Music Archive > > Subject: Re: [TeX-Music] 128th notes within PMX > > > > Am Mittwoch, 13. Juni 2007 16:48 schrieb Christian Mondrup: > > > Don Simons wrote: > > > > The error appears to be caused by trying to make a MIDI file. It's > > > > not likely I'll fix it any time soon, as it would require major > > > > revision of > > > > > > the MIDI timing scheme. If you can live without MIDI 128th notes, you > > > > could make a separate version of the pmx file for the MIDI. > > > > They should > > > > > > otherwise compile OK. > > > > > > Rather than maintaining different versions of the pmx file the ABC > > > preprocessor abcpp can be used for branching between MIDI and score > > > compilation within a single file. See the introduction to abcpp in the > > > tips and tricks section, > > > http://icking-music-archive.org/software/pmxtricks/abcpp.html > > > > Hi Christian, > > > > I will try this possibility later because I think that it will > > take some time > > to study this feature. > > > > Hermann > > > > _______________________________________________ > > TeX-music mailing list > > [EMAIL PROTECTED] > > http://mailman.daimi.au.dk/mailman/listinfo/tex-music > > _______________________________________________ > TeX-music mailing list > [EMAIL PROTECTED] > http://mailman.daimi.au.dk/mailman/listinfo/tex-music -- Dr. Hermann Hinsch Quinckestraße 44 69120 Heidelberg Tel.: 06221-436298 Email: [EMAIL PROTECTED] _______________________________________________ TeX-music mailing list [EMAIL PROTECTED] http://mailman.daimi.au.dk/mailman/listinfo/tex-music
