progress report

I now have code that I believe will do the job of feeding sample values to iOS's sound output system, using the new (as of iOS 8) Audio Engine facility, and I've begun work on the rest of the app (a complete rewrite) that I think will prove more interesting, in part because it will no longer have to complete renders while the sound system is waiting for input, which should eliminate artifacts caused by a lack of timely input.

Before I can test what I've already written, I'll need to complete some other parts of the app, but that is a matter of making time for it; the part I had only the vaguest idea how to do is already done, assuming it's correct.