Apple Logic Pro /LogicExpress Discussion

Going to show my ignorance here. I'm in the process of having a drum  
part recorded for a song I am working on in Logic and one of the  
questions was what was the bit rate, 16 or 32, and 32 was shown as the  
default. It seems I am working in 16 although I don't know why that is  
or which is better.

Then, I have just downloaded Session Strings, which on first listening  
has much more authentic string sounds than Logic, but it has stopped  
working, saying that my memory is too low. I am working on an imac 9.1  
with 4GB of memory and I have never had this message before. I have  
very little other than Logic and Native instruments running on my  
computer at the moment.

Mr Google, who is one of my best friends, seems to be suggesting that  
I would be better off working in 32 bit, but I have no idea whether  
this is actually the case, or whether I can switch from one to the  
other and still access my material on Logic, or indeed whether I will  
have a problem with my 16 bit drum part when it comes back.

This probably sounds like a dreadful old ramble, but if anyone can  
help me make any sense of it I would be grateful. The one thing I am  
loathe to do, although probably ought to, is to increase the memory of  
the imac. I wouldn't know where to begin!

Andy B