Splitters and Joiners for 3.5mm audio

[GR63]

I have a soundbar for a monitor which has no speakers built in. The monitor 3.5mm output passes the HDMI or DP audio out to soundbar but now I also need to occasionally put 3.5mm audio from another source to that soundbar. Was looking on AliExpress for a joiner cable but all I can find is splitters or cables described similarly.

I wonder, are they the same? I kinda assumed they need to be unidirectional but I am Jon Snow, I know nothing.

Is there something special I need or does a splitter work for me??

 

[GR63]

Joiners are bad idea it's basically shorting the outputs Displayport doesn't carry audio.

I just use a avr as that has plenty of inputs.

You need switcher that switches analogue, and HDMI inputs.

Display port does carry audio.... Well the outputs do and I use DP to HDMI adapters. Audio is on DP on all my Nvidia cards and all my AMD cards so you must have a faulty card if you don't have audio on DP?