I am Curious about adding the USB interface to a Audiomirror / Dac-ah ? is there a way to get it modded to add the usb direct, even if you have to eliminate the toslink or coax digital board ?
You may want to contact Vlad at Audio Mirror about thatcontact@audiomirror.com. You can certainly use an external conversion like a Waveterminal U24, Emprical USB Freeway, HagUSB or similar USB-S/PDIF convertor.