Aphex USB 500 Rack - Manual (Page 8)

Under Audio Input Device select 500 RACK (6 in, 10 out)
Under Audio Output Device select 500 RACK (6 in, 10 out)
Click Input Config.
Select 1 (mono) & 2 (mono) and click OK.
Click Output Config.
Select 3 / 4 (stereo) and click OK.
Select sample rate and set Buffer Size to 64 Samples.
Exit the Preferences window.
Open the mixer view.
At the bottom far right, click on the I-O icon.
The default set provides 2 MIDI tracks and 2 Audio tracks.
Find the audio track called 3 Audio.
The default should show AUDIO FROM EXT In, input 1.
Under MONITOR, click on AUTO.
Under the Master Output select 3 / 4.
Click the red track arm button and you should be able to hear yourself in the
headphones or headphones.
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