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AUM Sync Quantum
I'm familiar with the sync quantum method of recording a fixed number of bars within AUM. This has puzzled me for a while though: BPM set to 60, so 1 beat per second. I set the sync quantum to record 2 bars of 4/4 and I would expect a recording/loop of 8 seconds. Instead I get a recording/loop of 7.9999 seconds?
The closest I have been able to get to the precise 8 second loops I require is by setting the BPM to 59.9, which using the sync quantum method, results in a loop of 8.013 seconds. I then trim this to my required loop length in Audioshare. Close enough for jazz I suppose. 
Comments
What sample rate and what device? It turns out that the OS is a little whacky on some devices (like the iPad 6) that are natively 48k but offer 44k and returns strange numbers of samples per buffer. On those devices, I think you get precisely the right duration at 48k but not 44k.
Sorry, forgot to mention my device and usage scenario; it's a Mini 5, recording at 48k, and I'm still on iOS v13.7.