Legacy Apps Waveburner - fade in/out separately


I am looking for a simple (or any) way to fade the left or right channel of a region separately from the other channel in Waveburner. For example region A, left channel fades out before the right channel and then region B, left channel fades in first. I expect that this exists as there the stereo channels show up each with its own fade, I just haven't figured out how to split them.

Thanks for your help.