The Logic Off Topic list

Hi,
I was wondering if anbody has ever used more than one interface with 
Logic at one time. My setup is Logic 4.8 for Windows, I have 98SE, an 
ASUS TUSL MB, 1.2ghz. Intel Processor and 512mg. of ram. I use a 
Unitor 8 MKII hooked up to the serial port, but am all filled up and 
still want more instruments. 

I still have an open serial port available but I'm not sure if this 
will work efficiently. Any first hand experience?
Thanks,
Gary