We see no details about your "VHS sound" device (so we can't look at a manual, which you CAN) and how you have it connected. Presumably you're using analog RCA audio cables. THAT would work on any analog input EXCEPT Phono. Nothing complicated about analog sources. Outs to Ins.
Register and download the manual for free at retrevo.com
http://www.retrevo.com/support/Kenwood-VR-406-Receivers-manual/id/480ag201/t/2/
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