16 bit or 24 bit and what sampling rate?

Hi there
I have a Metric Halo Mobile I/O ULN-2 and an Intel iMac dual processor with 2Mb RAM. Should I be using 24-bit recording because I'm capable of doing so or is there no real world benefit? Also, what about the sample rate?
I'm producing music for CD and MP3.
Any thoughts welcome!
Thanks.
Steve

Always 24 bit. I'd rather have less tracks at 24 bits than more tracks at 16 bits. It's a difference most people, even non-musicians and engineers, can hear.
Sample rate: Most people will pick a sample rate based on the delivery format (44.1 for CD, 48 for DVD, etc.) if you don't know where the files will end up, 44.1 or 48 are both fine for rock and pop. Personally, I like 48. I used to do everything at 44.1 because 99% of the recording I do is for bands putting out CD's, which have a sample rate of 44.1.
Recently I have discovered that I like the way 48 sounds a little better. Maybe the machine likes it better, or something. I did a bunch of recording at 96 and 88.2 for a while but the files were huge and the extra dynamic range was not worth the extra trouble, IMO. That said, there are times when you'd want to use higher rates. In any case, I'm gonna say go with 24/48 unless there's a reason to use something else. I would also say experiment and listen so you are familiar enough with your gear that you'll know when to deviate from the norm.
-John

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