Setting the rate at which RemoteIO Audio unit render callbacks are called

Question

I've setup RemoteIO audio unit render callbacks for both input and ouput. I'd like the render callbacks to be called less often. How can I specify the rate at which they're called?

Answer 1

The callbacks get called once per buffer, so you can make them get called less often by specifying a bigger buffer size. At a sample rate of 44.1 kHz with a (huge) buffer size of 8192 samples you get about 2/10 of a second between buffer calls.

Audio callbacks can't be spaced out more than this because they exist to do per-buffer processing of incoming/outgoing audio. If you don't run the callback on every buffer, you no longer have realtime audio.