IOS core audio: synchronization of playback and recording with high accuracy (error <5 ms)

I try: - play click - record user audio through the iphone / ipad internal microphone

I need high accuracy both for the click track (<1 ms jitter per click) and for the alignment of samples to click (mismatch of all samples with a click compared to real measurements)

I studied the aurioTouch example and suggested that this is the best way to get low latency / high fidelity performance ... By taking aurioTouch as a starting point, someone can shed some light on how to make an exact click and then synchronize the recorded sound with that click ? By this I mean that I should know when various samples that are in time fall in relation to the click. We can assume that the user is wearing headphones, so clicking does not interfere with the recorded audio.