I would also add if you want to make the sustaining sound even longer, add 2 to 4 blank measures after the example Noel provided. I use it in bluegrass to make the ending fiddle note last just a little longer at the end and anywhere else I want to sustain the ending. In the screen shot I used that trick to make the tag ending of the 1950's song, The Night Has A 1000 Eyes, sustain until they just fade out.

Note that I set this example song to end at measure 52 even there are no chords after measure 49. Otherwise,the song will not end correctly.

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