Multiple audio inputs on single set of speakers

[bonethrack]

I am using a CA-3602 for my computer speakers and I had planned on adding my new echo dot to the aux port but it overrides the computer for sound is there a way for me to get both the echo and my computer sounds going through the speakers at the same time?

 

[Ironsounds]

Hello... Yes you need a hardware Audio mixer... Two Stereo inputs audio and single stereo audio output... OR four mono inputs and stereo output with breakout cables/adaptors (stereo to Mono). There are many flavors and types of Audio mixers... here are a few to give you a idea of what is needed.
https://www.amazon.com/dp/B0009X9H9I/ref=psdc_11974031_t3_B002VX0DCE
https://www.amazon.com/dp/B0009XH4HU/ref=psdc_11974031_t3_B0002CZQJ6
https://www.amazon.com/rolls-MX22S-Mini-Rack-Source/dp/B007EY7MH4

You can get a additional head phone output too B /
https://www.amazon.com/dp/B0002CZQJ6/ref=psdc_11974031_t2_B00102ZN40