Changing speed of groove~ also changes volume ?

    May 26 2010 | 10:08 am
    Hi there,
    It may seem as a newbie question but I have a weird feeling this morning. When I change the speed of a groove~ object by sending a 2 to a sig~ I feel the volume is louder than the original speed. Is it just a feeling or is it an natural acoustic fact ? And is there like a mathematical relation between speed and volume in order to keep the same volume while changing speed ?
    thanks a lot

    • May 26 2010 | 11:58 am
      there is a relation between pitch and loudness, but the factor depends on the material and is not predictable.
      just make some tests and find your personal value for lowering the gain (with the desired effect on the percepted loudness) like say, -3db/A per octave ...
    • May 26 2010 | 12:47 pm
      thanks for your reply Roman I will measure it with my material but does it mean it is going to be a different factor if I play on another PA ? thanks
    • May 26 2010 | 2:13 pm
      I think that this "material" Roman's talking about is not your speakers but the samples you're using. But I'm maybe wrong.
    • May 26 2010 | 2:45 pm
    • May 26 2010 | 2:47 pm
    • May 26 2010 | 2:48 pm
      oops, looks like we had the same idea. ish..
    • May 26 2010 | 6:50 pm
      very interesting readings... thanks guys ! that's exactly what I was looking for
    • May 27 2010 | 1:23 am
      fletcher munson, no not exactly what i was thinking of. because it wont really work for broadband audio like say, a piano sample or a drumloop.
    • May 28 2010 | 7:40 pm
      if you know the playback volume, maybe you could use a weighting-filter to calculate the perceived loudness and compensate for that...??