Trying to generate sine waves using this code, question about undocumented variable

Hey,
I'm trying to use this code as the basis for a procedural music generator, and have a question. Is there any significance to the number 32767 (used in the random function)? I assumed that it's the maximum number of points graph-able, but it seems a weird figure. The code I've lumped together can be found at https://github.com/smross106/Music-Generator/tree/master , contact there.