Aphex USB 500 Rack - Manual (Page 6)

You should now see signal on the input and output meters and hear yourself in
the USB 500 Rack headphones or speakers.
Avid Pro Tools
Launch Pro Tools and create a blank session.
Click the arrow next to Session Parameters and the window will expand to show
Audio File Type, Sample Rate, etc.
Select a Sample Rate and for I/O settings select Stereo Mix.
Give your session a name and location and click Save.
Go to Setup-Playback Engine.
Use the top dropdown menu to select 500 RACK.
Selecting this playback engine will automatically save and close your session.
Click Yes.
Click OK and your session will close and reopen.
Go back to Setup-Playback Engine.
Set H/W buffer size to 64 samples and click OK.
Go to Setup-I/O.
Click the Input tab. Select the current all paths and click Delete Path.
Click Default.
The path will now show 500 RACK Slot 1-2, 500 RACK Slot 3-4 and 500 RACK
S/PDIF 1-2.
Click the Output tab. Select the all current paths and click Delete Path.
Click Delete on the popup window.
Click Default.
The path will now show 500 RACK Analog L/R, 500 RACK Headphones L/R, 500
RACK Slot 1-2, 500 RACK Slot 3-4 and 500 RACK S/PDIF 1-2.
Click OK.
Go to Track-New.
Create 1 Mono Audio Track in Samples and click Create.