Mic input seems to work. When I first connected my PCI TV card up to use with Simon Wilson's excellent and ever improving TV card software I accidently connected the sound out on the tv card to the mic in on the Iyonix sound card.
Sound appeared from the Iyonix so it would appear the the line in and mic in sockets both work and the sound levels can both be controlled using the Sound configuration plugin.
As yet I don't know of software that can make use of the sound in other than the Iyonix sound sub-system. It would be great to have some Iyonix compatible sampling software so I could sample my remaining LP's!
But to say that the Iyonix lacks mic and audio in is incorrect.