Stream audio data directly from disc. This uses a fraction of the original sounds size of memory. Use this for your music or very long tracks. Depending on the hardware, a general advice is to keep this down to 1-2 simultaneously streams.
I’ve been able to stream 20 odd audio files from disc on an iPad 2, on an iPad 1 it can slow it down a bit. There are some disadvantages to streaming from disc on iOS, like you don’t get to do negative pitches and you don’t can’t use GetOutputData and GetSpectrumData