[Scott Smitelli]

I think I have an idea what you’re trying to do… It’s possible, at least in Audition. (Not sure if Soundbooth has this effect.)

You might try the “Dynamic Delay” effect.

* The original/delayed slider should be 100% delayed.
* Turn “loop graphs” on, and set the frequency to 24 Hz.
* In the Delay graph, turn Spline Curves on, and draw a graph so the right and leftmost points are set to 0 ms delay. Then right in the middle, draw a point at 1 ms or less. (This is what you tweak to set how “bad” the projector is.)
* The Feedback should be flat at 0%.

This creates an effect sort of like a tape slowing down and speeding up very slightly, 24 times per second, much like a cheap film projector. If you overdo it, people might start sounding something like Chewbacca. So set your delays carefully.

And don’t forget the bandpass filter. Those old projectors weren’t exactly known for their audio fidelity.

[Scott Smitelli]

It looks like the second wave is using the Hard Limiting effect, with the max amplitude set to -1 dB. Personally, I would use Normalize instead (it doesn’t distort the wave at all, it merely decreases the overall amplitude) but that’s not what your second image is showing.

[Scott Smitelli]

Hi Marco:

I’m having a little bit of difficulty understanding your English, but it seems that at least part of your problem might be coming from your ASIO driver settings. If Audition stops playback or recording whenever you switch to another running application, you can change that behavior.

Go to Edit > Audio Hardware Setup and select the tab that corresponds to the mode you’re interested in (Edit, Multitrack or Surround). There’s a setting for “Release ASIO driver in background” that, when checked, makes Audition stop playing or recording and “release” the sound hardware whenever the program loses focus.

That might help you out.

[Scott Smitelli]

Also, is the video running at “true” 24 FPS or at 23.976? That type of discrepancy will cause a slight drift (~1.4 frames per minute) that can add up over time.

[Scott Smitelli]

With Audition 3 (and 2, if I remember correctly) you can use the Scrub tool to locate the precise area of the wave in question. While scrubbed audio is playing, press and hold the Shift key. The entire region from when you pressed the key down until you let the key go will be selected. That’s one of the most efficient ways to generate a selection while listening to the audio.