If you recall from this post there has been a bit of discussion on MIDI timing in iOS. David Lackey of Innerclock Systems, which specializes in the syncing of devices, just ran a few tests. Sync appears to do better with KORG's Wireless Sync-Start Technology WIST, and of course internal sync, but not so well with external hardware MIDI sync. He ran tests with an iPad2 64GB OS 6 synced to an Akai MPC-3000 which is known to have great timing. You'll find the full results for each app tested at Innerclock Systems here. Note this is for the iPad syncing to other devices and not other devices syncing to the iPad. I'm curious if it will be like the Roland TR-909. The 909 syncs horribly to other gear but other gear syncs to it fine.
via David Lackey on the Facebook post thread here (keep an eye on it for updates): "Regularly 11ms slop between consecutive 16ths at any Tempo from a stable Midi Source. Detectable by even the most rhythmically compromised human being? Absolutely. A serious musical instrument contender? I'll leave that to your own subjective judgement. Note that the jitter is consistently around 560 samples between consecutive 16th notes regardless of Tempo. It will 'sound/feel' better at slower tempos because the slower you get the less that jitter value impacts as an overall percentage on the tempo/timing precision."
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