Possibly more complicated than you're looking for, but I added some comments to an old (and not very good) counterpoint melody generator and pushed it here: https://github.com/mlochbaum/JSound/blob/master/counterpoint.ijs
The repository as a whole has tools for synthesis and mixing as well as a function to write a .wav file. With these I can turn a melody into an actual sound, and then a playable file: load '~user/Sound/synth.ijs ~user/Sound/counterpoint.ijs' ]m =. 17 (melody-]) _7 NB. 7 notes, mixolydian mode centered at 0 0 2 0 5 4 2 0 _3 _1 _3 2 0 _1 2 6 2 0 l =. <.F * (%2) * 60%110 NB. Eight notes (two per beat) at 110 BPM s =. sine l # m trans note 'd' NB. Turn into a sine wave s =. ((#m) rep 0.1^I l) * s NB. Exponential envelope 'a.wav' writewav~ (-:max) * s NB. Write to file at half max volume The function play writes a file and immediately plays it. It requires the aplay command which comes with Linux but I expect it would be easy to write a version for another operating system. play (-:max) * s Marshall On Sat, Mar 28, 2020 at 05:27:46PM -0400, Devon McCormick wrote: > Hi - > has anyone done work with generating music or musical phrases in J? I'm > helping someone develop a music training game that starts by generating > sounds with a particular key, tempo, and phrase length. The idea is to > help students to train their ears by testing them on their ability to play > back a randomly-generated musical phrase. > > I've told my collaborator that I think the generation part should be > relatively straightforward but I am not schooled in music, so I'm not sure > how to start. > I'm guessing that the second part of comparing the user's response to the > generated phrase will be more difficult but I'd like to get any kind of > start I can. > > Does anyone have any ideas about this? > > Thanks, > > Devon > > -- > > Devon McCormick, CFA > > Quantitative Consultant > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
