I am new to anything past the very basics of Audacity only using it for file conversion, cutting and normalising in the past.
I have been given a backing track to use in an amateur dramatics musical review, but the track has been cut from a longer piece. The end is very abrupt with no natural sustain (it just stops at the zero crossing point of the waveform) and sounds horrible.
I don’t have access to the original track, so is there any way I can clean up the ending? I have tried Paulstretch but not had any success, but I am not sure that is the right way to do it in the first place.
A couple of times I’ve added some echo and/or reverb to the last few beats. With the echo, I like to count the beats-per-minute to calculate the time between beats, then “synchronize” with a delay of 1, 2, or 4 beats (depending on what sounds best).
I don’t think echo or reverb will extend the length, so you may have to add some silence to allow room for the echo/reverb. (You can optionally re-trim and/or fade later).
Echo & reverb “add” to the amplitude, so you may have to adjust-down the level the volume where the echo/reverb overlap the original audio (with the Envelope tool).