The way I have done this in the past, put your music on the first audio track, cut the track just before the last note and copy the last note, in sync, on to ttrack 2. Add a reverb effect at 100% wet to the second track and adjust tr2 level until it sound correct. As with all things audio your ears are the best judge for reverb type, decay and level. You may want to put a short fade on the end of the last note on tr1 and possibly a fade on the start of the note on tr2.
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