iConnectivity host is midi only.
Audio is on the device ports only, it’s also discontinued(iConnectMIDI4+).
Easiest solution is an Intel NUC or other mini pc and VoiceMeeter Banana/Potato.
https://vb-audio.com/Voicemeeter/banana.htm
A Raspberry Pi should be quick enough to handle a couple devices, but I don’t know of any software like VoiceMeeter.