Thanks giuliomoro for the help! I'm actually after running the audio i/o with full anti-aliasing of the input and output at 88.2 khz, thanks for pointing out that the setting I was adjusting is for the analog i/o only. Is there an easy way to adjust the main audio i/o sample rate with a flag or some other method? If not then I'll hack into code and hardwire it. I don't mind doubling the block size since the latency will be identical anyway.
I've just noticed that the standard arm_neon.h is available, so everything is good with regards neon and intrinsics Thanks for pointing out you've also included the math_neon library, it's good to have some solid neon examples to work from to port my existing sse fast maths libraries.