I need a mixer where I can mix the audio track (music) of my laptop with the audio track (stereo) of my PC, so that I can hear both on my headset and I can still use my microphone integrated in the headset.
A nice feature would be if I can connect my phone as a kind of "Soundboard". (Not absolutely necessary)
Take a look around, in the store you will also be very well advised when it comes to special things. Link can't be set, allegedly offensive.
The store is called --- Just Music --- once to google