Fix tail end of output

[maxgillham]

The while loop goes to (length//(4*end_of_bar))*(4*end_of_bar) which is less than the actual length of the song. It needs to be like this for indexing issues but now the end of songs outputted switch back to original version.

[maxgillham]

I made it cut off beyond this value, but would be nice to fade out using sox.
Consider putting a fade out before (length//(4*end_of_beat))*(4*end_of_beat), so that when it hits the cutout part, the amplitude it already 0. Just essentially find a way to end song less abrubtly