Here’s a Simple two line output combiner – Sometimes there is need to combine the output of two line level audio sources to be fed to one input. A standard way in professional audio is to use a mixing desk, but on home audio system you might want to look for a simpler and less expensive alternative. Link.
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Hi there; it looks like the link above no longer works. Any chance of a re-post?
http://web.archive.org/web/20070602004531/http://www.tkk.fi/Misc/Electronics/circuits/linesum.html