Investigate Melody Playback

[rtwaltman]

In the original repository that we started with this quarter, building and playing melodies using the melody GUI did not work correctly. We had the following behavior:

• If we add a single note to the melody and try to play it back, we get a very short, truncated note
• If we add a second note to the melody and then play it back, both the first note and second note would then play back correctly.
• If we add N >= 2 notes, playback works correctly for all notes

Now, after completing issues 18 and 19 (https://github.com/UCSB-CS56-Projects/cs56-music-basic-synthesis-demo/pull/23), we have a similar issue. When building a melody, we have the following problems:

• If we add a single note to the melody and try to play it back, we get no sound output
• If we add a second note to the melody and try to play it back, we get a short clip of sound, which is undiscernibly different in length from the original truncated sound we experienced above
• If we add a third note to the melody and then play it back, all three notes play correctly in order
• If we add N>=3 notes, playback works correctly for all notes

Investigate and fix this problem, providing a description of the cause of it in the pull request for the issue, as well as a description of the changes made to remedy it.

[bronhuston]

Approved!