Now that Release 4 of the Symphony I/O is out you have 4 ways to connect ;

• - USB 2.0
• - Symphony 64
• - Protools HD / HD Native
• - Stand Alone

AIM for Complete Compatibility
With a simple adjustment using the front panel encoder knobs, AIM transforms Symphony I/O into an interface optimized for the mode that’s been selected.

Modes:

• Symphony PCIe
• Pro Tools HD PCIe ( TDM & Native )
• USB Audio
• Standalone

So there has never been a better audio interface solution that offers the complete compatibility & audio quality in a single unit for this price .