i usually rec at 24/48. sometimes the cards fill up and i will rec at 16/44 on a sdhc card that already has several 24/48 files on it. a couple of times when i did this, the 16/44 files would not play back. they were on the sdhc, but i could not do anything with the data. my question is, should i only record one sample rate/rec mode on a card? not mix and match?