You need to do your own mixing. First you need a way to get each note
and then a way to know when each note should play.
With that information you can start mixing, read the value of the first
sample from each note currently playing and add them together, this is
the mixed value. Now write that out and you have mixed one sample worth
of audio.
Repeat a few million times, but with the next samples and you are done.
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