interpolating delay


    Jun 30 2013 | 10:23 am
    hi there
    a friend of mine has been doing live delay line looping (from any input source) with pd, manipulating the time (length) and feedback on a delay and getting interesting looping-stretching-compressing effects from the feedback back into the delay.
    My attempts in max have been unsuccessful so far and I am a little lost. He has been using an object called vd~ which is described below.
    Is there something similar in max, or a way I can get the same sort of result through a delay line?
    [vd~] implements a 4-point interpolating delay tap from a corresponding delwrite~ object. The delay in milliseconds of the tap is specified by the incoming signal.
    attached is an image he sent me of the basic part of the patch
    thanks

    • Jun 30 2013 | 10:44 am
      in m4l there's m4l.vdelay~ - it's essentially ej.vdb~
    • Jun 30 2013 | 10:51 am
      AFAICT The max 'equivalents' of delwrite = tapin~ and vd~ = tapout~ (not sure about 4 point interpolation FWIW). A signal should be connected to the tapout~ inlet to enable continuous variation in the delay time (as illustrated in the right hand part of the tapout~ help file)
    • Jun 30 2013 | 11:39 am
      >not sure about 4 point interpolation FWIW
      that's the most crucial part of the OP; that when messing with the delay time it should have those "looping-stretching-compressing effects"
      You get those by using "variable delay buffers", called VDBs. Those take it from the wibbly-wobbly territory into the timey-wimey territory.
      They're excellent FSU objects too, they've been my go-to for a number of years now. Interestingly they make great looper objects too, since they handle delay-time-changes so elegantly.
    • Jun 30 2013 | 12:30 pm
      Thanks for the clarification Wetterburg. That makes more sense of the original request - and I learned something...
    • Jun 30 2013 | 12:45 pm
      If you haven't tried m4l.vdelay~, do go and have a play with it, it's pretty amazing.
    • Jul 01 2013 | 4:04 am
      thanks, just got m4l.vdelay up but no help file. Any idea where I can get an example?
      thanks for your help, really appreciate it
    • Jul 01 2013 | 4:36 am
      sorry, found it in m4l-patches tools resources. But I still can't get anything from it. No sound.
      Am I right to think I patch a sound source say mic or sample playback) into left inlet and control delay time through right inlet, and resulting audio signal should come out outlet? I don't get any sound.
      Also, can you control feedback of delays?
      sorry for my ignorance on this
      drew
    • Jul 01 2013 | 6:50 am
      Hi,
      M4L.vdelay is an abstraction. You can doubleclick it to see how it works. You need to connect a tapin~ instead of a direct audio signal...
    • Jul 01 2013 | 8:55 am
      Does this help?
    • Jul 01 2013 | 9:23 am
      ahh yes, thanks got that now. Excuse my ignorance, I have that working but am struggling to get a looping effect.
      should I also be connecting a tapout~ somewhere? or feeding the signal back into M4L.vdelay somehow to create real time loops to manipulate?
      sorry for my confusion, if you know of any examples I can look at using M4L.vdelay I'd be happy to research from there
      much appreciated
      drew
    • Jul 01 2013 | 10:00 am
      thanks will have to look at it later, but i'm sure it will be great help, again thanks
      drew
    • Jul 03 2013 | 11:27 pm
      finally got to looking at the patch, made it make more sense for me.
      thank you very much, most appreciated
      drew