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Dont use any tempo changing effect AFTER your song is done. U really has to do it in your project, before exporting, or u will get crap sounds.
Its just like working with images. When u ar in your project, u can move and edit your layers freely, but once u merge everything into a single file, u cant move each element anymore, unless u do some cutting-fixing.
With sounds its the same.
When u are working in your project, your synths are programed to generate a given sound at a given note, with given lenght, and it wont change with tempo, the tempo will only affect the space of time between each note.
But when u export it, everything becomes a single merged wav shape, and when u change the speed of a wav shape, its pitch changes as well. What these plugins that change tempo without changing pitch does, is a kind of cutting in each sound element it encounters in the song, and add-remove some silence time between them, but its never 100% acurate, especialy if u work on a complex file with lots of synths and percussion, so, u HAVE to to your tempo changes still in your project, never do it after.
Just automate it as u like.
MIDI are exceptions to this just because they are not wave files, they are files containing info on how notes play, in how much tempo, in which pitch, and so on, and the computer interprets it and generates the sound output real-time, just like when u are working on a project. So, if u change tempo in a MIDI file, its just reconstructed with this new setting. There are some more sound formats that works like this... But that doest help, since MIDI sucks, except for exporting notes info.
Hope this can help u
Ask if u didnt understand something 
Last edited by NicklessGuy on Jun-09-2003 at 15:25
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