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However, it's a processor which is going to add interpolation points (e.g. I've had decent results, granted it takes a VERY long time to do it's processing That's only only other option I can think of. I hope someone has been playing with slow-down in this sort of range of 40 - 100x and has some possibilities worth exploring that they are willing to share. This is a very old version of the project (two more itterations now), but you get the idea - 2 foot tall copper and steel boxes in mid air, wanting to get an accurate sonification of the collision.
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In the past i have just recorded at 192kHz, slowed the sound down in Soundtrak Pro's stretcher, and then added transint peaks on top to preserve some of the punch that i imagine would be happening (!) i may perhaps end up editing heavily, or even foley-ing the whole thing, but at the moment i really want to understand what is happening sonically at very slow speeds - to be able to hear the smallest times and what is going on there. What interests me most right now is getting the sound accurately slowed, so that i can understand what is happening and link it to the visuals of the film. I am wondering if recording 1bit 2.8MHz DSD is worth considering - giving me enough sampling speed to really play with resampling and slow time (i realise this will lower the pitch also.) or are there other options to consider? i have tried phase vocoder stuff, which smears the transients and all detail, i have tried paul's extreme sound stretch (which does the same, obviously, though is more suited to extreme stretching), i have tried reel to reel, re-recording and building the stretch over several passes (which becomes quite noisy), and digital resampling (which from 192kHz ends up being quite glitchy.) i am NOT a sound designer, but i am trying as much as i can. what i would love to know is possible ways to slow down the audio 40 - 100 times (yes, a lot) using digital means.
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I am working on a project where i crash together 2 foot copper and steel boxes in mid air (using a pneumatic colliding machine i made - yes, silly.), and i use old 16mm film to record slow motion of the collisions, and record sound using piezo film sensors and standard mikes.