Help with granular playback engine.


    Mar 08 2010 | 4:44 am
    Hi folks,
    I am working on a granular playback engine for an installation that has to be driven a certain way, so the control mechanisms may look a little wonky, but whatever. My problem is thus:
    I cant figure out a way to only update the grainsize at the beginning of each grain without creating a feedback loop. As of now when modulating the grainsize pitch shifting takes place which i want to eliminate.
    I know there are other tools for this, but I want certain features, and also the DSP exercise.
    Thanks for the help
    j5

    • Mar 10 2010 | 2:38 pm
      I know this is prolly hard to read through, but I would really appreciate someone giving this a look, even a "dude, yer doin' it wrong" would be helpful if constructive.
      So again I'm looking for any suggestions on how I might update the grainsize at only the beginning of each 'grainWindowPhasor' period.
      Thanks again,
      jonnyfive
    • Mar 12 2010 | 2:47 pm
      Hey Jon, I have been studying you patch. It is a complex patch!
      I think the problem you are running into is similar to trying to
      create a variable length delay line. As you change the position
      of the read head, you effect the rate that it reads at.
      One suggestion I would offer is that you only read grain size changes
      when the grain phasor is at the end of its cycle. Maybe use [sah~ 1.0]
      to gate user input.
      I will keep studying things a let you know if I discover anything.
      This is a very good path. Knowing how to do granular synthesis from
      scratch is a always enlightening.
    • Mar 12 2010 | 3:02 pm
      Thanks for taking a look anthony!
      Yeah, thats the problem i have been running into is that i want to take the control input for the sah~ off the output of the windowPhasor, but that patch calculates its output signal based on the grainsize...
      I have been letting this rest, but i think i have an idea for for a work around with another control phasor~ + rate~, well see...
      anyway thanks for looking at it :)
      -j5