I am connecting an external audio source to the Audio In jacks and although I do hear it in the on-board speakers and headphones the audio input signal is not coming out of the line outs. What am I doing wrong?
The Owner's Manual (pg. 2-5) indicates that audio fed to the Audio In jacks is mixed with the internal sounds of the SPS4-8 and sent to the Line and Headphone Outputs. This is unfortunately a typo and inaccurate. The Audio In signal is only routed to the SP4S-8's own internal sound system and headphones, not the Audio Outs.
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