You can use the Tape1 and Tape2 "PLAY" as a line level input.
For example, connect the CD player output to Tape1 "PLAY" input, switch on the Tape Monitor1 for CD playback, switch it off to select other source.
For example, connect the CD player output to Tape1 "PLAY" input, switch on the Tape Monitor1 for CD playback, switch it off to select other source.