Steve, thanks for the info.
Ok. First, I trashed everything I downloaded so I had a fresh start. I unplugged my usb per your instructions. From M2Tech's site, I downloaded 10.5. My computer is 10.5.8 so I guess this is the right one. I unzipped it, and opened the file. The "installer" screen came up and asked for my password which I entered. It read "Install Succeeded". My next move had two attempts. 1) After "Install Succeeded", I plugged in the usb interface, then restarted the computer per the programs instructions. 2) After "Install Succeeded", I restarted the computer THEN plugged in the usb interface. After both attempts the next move was to go to System Preferences and choose the "hiface" output. Both attempts were unsuccessful. Both times when I went to System Preferences my only option was the built in optical output. I went to Midi and again, it only showed built in output, It would not show any "hiface".
If I have a 10.5.8 OSX, then I think the 10.5 driver is the correct one??? I guess I can try downloading other drivers but they are 10.4 and 10.6. I can't imagine any of them being the correct one.
If I understand correctly, I think the new 2.0 interface from M2tech DOES NOT require downloading a driver. If so, that's what I'm going to do.
Once again, any help would be greatly appreciated.