Decelerando...

Ashyukun · Post by **Ashyukun** » Tue Jun 17, 2003 10:09 pm

OK, in order to trim the audio for my video down a bit and make it more manageable, I need to create a new ending. No problem, I've got everything worked out except one thing- I need to be able to decelerate the last few measures to a slower tempo so it actually sounds like the song is supposed to end where it does. Only, I can't figure out how to do it.

I can get the audio to decelerate just fine- AfterEffect's 'Time Remapping' will let me do that without too many problems (most stemming from the fact I've never used it before- but it's damn spiffy)- but the pitch drops accordingly with the speed when I do that. And I can change the speed while keeping the pitch correct using Sound Forge- but I can only seem to do it in step functions not by slowing down gradually. Has anyone ever done something like this before and can help me out? Or just have any ideas on how to do it in general? Thank you!

ongakuka · Post by **ongakuka** » Wed Jun 25, 2003 1:20 pm

I've not done this in SF, but this is how I used to do it in Cool Edit Pro; hopefully it's similar. You want to set trackpoints/keyframes on the section of your audio that you want to slow down, shape the curve at which the filter will follow, then apply the stretch filter to that curve. The tempo will slow down in relation to the individual points on the keyframed section, but the pitch will remain the same. If you want the pitch to change as well (as the tempo slow, the pitch lowers - like a record spinning down), use the bender filter.

You can also do the same thing in AFX if you're familiar with keyframing.