I have an EXD USB card that is connected to the B III using the SPDIF_4 input card. This works very well. However, when I add another input (S/PDIF), the USB signal mutes. The second S/SDIF signal works well, both when the USB card is connected and when it is not connected (I use the standard input selector switch). Any idea how this may be cured?

Today I explored the problem further. I switched to the B IIIse. Using the TTL level S/PDIF signal from the USB card, this works nicely. Then I added a consumer level S/PDIF input. As above, both work in isolation, but when both are connected simultaneously (using the I_PS to switch inputs), only the consumer level S/PDIF signal is detected.

Please help!

Frode