The best performance we've got in 96khz 24 bit / 22 tracks audio recording simultaneously
is with ca 60 MByte/sec " storage write " disk speed on iPad 3/4 measured with "PerformanceTest Mobile" free App.
(64 GB disk memory iPads).
We ascertained that some iPads 2/3 or 4 had the same disk performance = ca. 22 MByte/sec " storage write " speed.(16GB disk memory iPads).
Be sure that your iPad4 has more than ca. 22 MByte/sec " storage write " speed, if you need the best 96 khz 24/bit recording performance.
For comparison only,
22 MByte/sec " storage write " speed allows in 96 khz / 24 bit recording only
10-12 Tracks simultaenously on iPad 2 / 3 or 4.
Jan Hiltmann, Product Planning / Quality Assurance
Steinberg Media Technologies GmbH