[Jennifer Adams] ” I can’t find any way to modify the curve except choosing one of the fade type preconfigured options…”
These are good as they get, when we want to do a quick and easy fade. If you want a more controlled and “shaped” Audio fade is to “Insert Volume Envelope” and apply Points along its length. This way you will have an infinite range of Volume control and throughout the whole Event or the Track you insert your Volume Envelope on.
You might like to also explore the Pan Envelope as when as the Mute Envelope too.
So:
1/- Insert Volume Envelope: Right Click on the Track Header of the EVent and slect Insert Volume Envelope – or, Shift+V
2/- At the place on the the Volume Envelope where you wish to start dropping the audio volume, Right Click on the Envelope and “Add Point”.
3/- Add a further Point a little way away and Drag the Point down. You should see the Envelope being “pulled” down.
Cheers
Grazie
Video Content Creator and Potter
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