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Most of that looks like the Mozzi library.

The more clock cycles something uses, the longer it takes, so the speed is slower.

If you're using Mozzi, this question would be best to ask on Mozzi's forum.

https://groups.google.com/forum/#!forum/mozzi-users

Or you could start digging through the Mozzi source code to see...

Perhaps you're thinking of the Mozzi library? It's a completely separate library from the Teensy Audio Library.

You can use either of these on Teensy, but they aren't designed to work together,...

Except for the noise reduction involving unspecified algorithms, you can do all this pretty easily with the audio library.

Most of the examples use the audio board with I2S. Of course you can use...