Using matrices in sequencing


    Jan 20 2008 | 9:27 pm
    Hi all, and sorry if I am flogging a dead horse here,
    I am well under way in a step sequencing project that stores all note
    data inside Jitter matrices. My immediate concern is going from a
    frame-based system to a timing-critical one:
    Right now I am using simple [getcell $1 $2] commands to retrieve the
    data I need, but will doing a call like that 16 times per step be
    efficient enough? The sequencer is a 16x16 grid.
    Another method that might be considered is shifting and then splitting
    the sequencer data with something like
    jit.rubix->jit.scissors->jit.spill. Even though this would involve more
    jitter objects it would allow me to grab all 16 sequencer "rows" in one
    go - but will the timing be there?
    Anyway, again, sorry for brain-storming out loud, but I would really
    appreciate any feedback here, since building both systems and then
    comparing them seems like quite an enormous task.
    cheers,
    Andreas.

    • Jan 30 2008 | 11:10 pm
      Hi Andreas!
      Iam in the same shoes as you, Ive build an 1024(16th) x 128(midi pitch) stepsequencer in max with jitter matrixes. When I am doing anything with any max window, I mean moving around etc especially with the patches window, I get serious timing problems, but using [el.samm~] a sample accurate metronome from Lyon Potpourri gives me a tighter groove.
      I read the data with getcell in a combination with uzi and counter and the timing is ok, I mean my midi monitor app reports polyphonic events in the same time. However when Ive put a third dimension for the midi channel, and use a x16 uzi to every x128 pitch in every 16th....Ive got a serious cpu overload...It means reading from a matrix 2048 times in each 16th step. I just use 16th rather than 16th of a 16th, If i got your question well...
      Please look at my patch there: http://debreczeni.info/
      Download the padKONTROL.zip file. It`s made for the korg padkontrol, but maybe you can get an idea in the [p matrix] patcher.
      I also have a question: can I read or how can I read data from a matrix if I just want to read just those points that has got values greater than zero ? I mean to read just those who has a velocity value > 0 ?
      because that way I can put a third dimension for all the 16 midi channel, to be able to drive 16 different instruments at the same time.....