Can my iMac run Lion in both 32-bit and 64-bit?

I'm trying to use an audio/midi interface (for music recording) that is formatted 32-bit. Can I easily switch between 32-bit and 64-bit on my new iMac without affecting the performance of the iMac?
Thanks!

OS X Lion is a 64 bit operating system to run only on 64 bit processors, there is no 32 bit mode.
However you should be able to run 32 bit software, it just uses half the registers.
What more likely is the problem is the software hasn't been updated for OS X Lion, not as much if it uses 32 or 64 bit code.
You really shouldn't have to worry about such things, if the software doesn't run, buy a older Mac with 10.6 used and use that instead.

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