RCA Switch that can output two inputs simultaneously? Does it exist?

[Badsearcher]

Hello,
Long story short, I have an amplifier* with RCA inputs and what I want to do is connect a computer audio interface and guitar multi-fx to the "video" channel on the amplifier so that the amplifier outputs both sources simultaneously. Does something allowing this capability without too much distortion even exist?

I already tried to use splitters** but what I found was that while the output plugged into the female end closer to the male sounds fine, the output plugged into the farther female sounds like muffled and distorted garbage.

So in conclusion, what I basically need is something like an rca switch that has an option to output two inputs simultaneously.

What is possible?

*http://images03.olx.com/ui/1/64/58/3955658_1.jpg

**Amazon.com: AudioQuest adapter - RCA male to two RCA female - hard assembly: Electronics

 

[Frank Berry]

What you need is a mixer.

 

[Badsearcher]

Hmm...

A mixer you say, any recommendations?

 

[Badsearcher]

Money isn't a huge limiting factor. As a general rule is a powered mixer better than a passive one. I'm considering buying this guy but some of the reviews complaining about attenuation are making me hesitant.

http://www.amazon.com/Rolls-MX42-St...UTF8&qid=1381440124&sr=8-1&keywords=rca+mixer