Lexicon Alpha Desktop Recording Studio Owner's Manual page 22

Recording Using the Microphone/Line Input
3. In the Inspector, click the Left - Stereo In box and select Stereo In - Right for
4. In the Audio 01 window, the Record Enable button
the track input source. (Stereo In - Left relates to Line 1/Inst, Stereo In - Right
relates to Line 2/Mic inputs.)
If it isn't, click it so that it turns red.
22
should already be red.