Lexicon Alpha Owner's Manual page 21

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