Aphex USB 500 Rack - Manual (Page 3)

At the bottom right of the GarageBand screen:
Set Input Source to Mono 1 (USB 500 RACK)
Set Monitor to ON.
You should now see signal on the input meters and hear yourself in the USB 500
RACK headphones or speakers.
Click the red record button to record your voice.
Cockos Reaper
Select Reaper-Preferences. Then select Audio-Device.
Under Audio Device Settings, select USB 500 RACK as your Audio Device.
Set Request Sample Rate from 44.1kHz to 96kHz.
Set Request Block size to 64 samples. (If you hear pops and clicks in your audio,
come back and set the I/O Request Block Size to 128. Set this as low as possible
without hearing pops and clicks.)
Click Apply and then click OK.
Go to File- New project.
Go to Track-Insert New Track.
The new track will appear in the edit window AND the mixer window below.
Below the fader in the edit window for the new track is a dropdown list that allows
you to select a mono or stereo input for the track. It should default to USB 500
RACK Analog 1. If not, you can select it.
Below in the mixer window is the Master Fader. Click on the I/O button just above
the fader. USB 500 RACK Analog 1/ USB 500 RACK Analog 2 should come up
as the default output. If not, you can delete what has come up as default and
select USB 500 RACK Analog 1/ USB 500 RACK Analog 2.
Exit the Outputs for Master Track screen.
Click on the Speaker icon of Track 1 in the mixer section to monitor the
recording.
Click the red circle (Track Arm) on Track 1.
You should now see signal on the input and output meters and hear yourself in
the USB 500 RACK headphones or speakers.