Adding or cutting time from music track in xLights

I could have sworn I saw Keith shorten the end of a music track that was largely dead quiet. Perhaps my memory fails and he did it on an animation track.
Is there a way to adjust these lengths in xLights or would it be better in Audacity?

Thanks
Mark

You can shorten an audio track in sequence settings but you have to extend with audacity from memory.

OK, thanks.