Thanks Sape for your kind comment.
This time, my case is at now, however, related to the number of
channels, 8 (7.1) for this case, but hard coded as 2 in the source.
After solving this, I may touch the problem you encountered.

By the way, I learned somewhat so far:

>desc 1.0 [12] 0x24: 1.1: Audio Input Terminal Descriptor
>	bTerminalId 4, wTerminalType 0x201 (<unnamed>), bAssocTerminal >0 bNrChannels 2, wChannelConfig 3, iChannelNames 0 iTerminal 0
>Device can record from <unnamed>

This 0x201 must be microphone.

>desc 1.0 [12] 0x24: 1.1: Audio Input Terminal Descriptor
>	bTerminalId 5, wTerminalType 0x605 (<unnamed>), bAssocTerminal >0 bNrChannels 2, wChannelConfig 3, iChannelNames 0 iTerminal 0
>Device can record from <unnamed>

This 0x605 may be S/PDIF...  This device has S/PDIF input and output for
light connectors.   Unfortunately, this device has no CD input connector,
which may make me to forget internal DVD drive of the desk top?

Kenji