Granular at audio-rate


    Jun 23 2011 | 2:17 pm
    I've been trying to change the grain duration at audio-rate, but can't figure out how to do it. I walk through the grains with a phasor and I want to be able to change the speed of the phasor only at the end/start of a cycle.
    In the patch below you can see what I've tried so far. Now I know this won't work, because it's a feedback loop. But I don't want to have the delay of one vector size either.
    I've also tried to use two phasors, firing one after the other has finished a cycle, but I can't figure out how to do this right as well.
    Any help?

    • Jun 23 2011 | 4:20 pm
      i am no expert. i muddle along with all this stuff and get reasonable results. you need to introduce the secret MSP 1 vector delay:
      you should search this forum as there are many excellent patch examples of exactly this sort of thing, going back many years. basically, sah~ is your friend, small use of vector delay is your friend, and you will be interested in the awesome volker bohm external [vb.phasor0~] and the andrew benson signal externals, especially [wait~].
      good luck.
    • Jun 23 2011 | 4:23 pm
      p.s. - you only want 1 phasor~ for EVERYTHING. use the rate~ object lots to split up your syncs and timings. also, forgot to mention:
      best
    • Jun 23 2011 | 4:25 pm
      oops! that first exaample should have been audio rate send/receives of course!
    • Jun 23 2011 | 9:22 pm
      Thanks for the advice. But all your examples use a delay of 1 signal vector. Maybe this isn't that bad. But actually I'd rather have my patch to be absolutely sample-accurate.
      So I wondered if there was any other way to do this. Maybe some construction which doesn't involve feedback. Then you wouldn't need the vector delay.
    • Jun 23 2011 | 10:09 pm
      I wouldn't call myself a digital-audio/DSP guru, but I've been researching this exact topic for several months and all the above comments and recommendations hold true in my own implementation of a granulator in Max.
      There are numerous threads here, going back several years recommending different approaches and the 'central' [phasor~] to [play~] plus [sah~] algorithm works best (for me);
      +1 for vbphasor~; it does exactly what is expected - I just built my own though, for more specific control.
      This related thread may take you someplace helpful... https://cycling74.com/forums/help-with-an-exercise-about-filters
      Brendan
    • Jun 24 2011 | 9:47 am
      Hey,
      But this actually doesn't work. I've tried both the tapin~ tapout~ and the send~ receive~.
    • Jun 24 2011 | 9:54 am
      Hi
      now it works:
      Later this weekend I will be posting a detailed video description of one approach to audio rate granulation, on my blog if you wish to see it:
      Best Brendan
    • Jun 24 2011 | 1:33 pm
      Thanks. I'll use this then for now. I'll check out your video, maybe it'll help me with some other difficulties.
    • Jun 24 2011 | 7:54 pm
    • Jun 25 2011 | 9:29 am
      oops, sorry: