Music-Synthesis
Piano simulator.
Regarding notes...
See this Issue about note/tone generation, which was a GREAT question!!
The implementation of note vectors is left application specific and up to the programmer. One might prefer a sine wave over a square wave, for instance.
My own note implementation (shown here) takes in two parameters. The first is the key number on the piano and the second is the duration of the note in seconds. The keys are ordered from left to right such that middle C (C4) is key number 40 and E4 is key number 44 (if you count blacks). When generating notes, a sampling rate of 8 kHz is the typical standard. If you'd like to see how I implemented notes, email me!
Notes are amplitude modulated based on a typical ADSR profile. This softens the otherwise abrupt transitions between notes in a song.