Matrix Talk:Soundcard-Tags
From AlsaProject
About the tags [RCAio] and [TOSio]
These are to do with the physical connector rather than the protocol being used.
(We don't call analog connections "XLR" "RCA" "3mm-jack")
I'd suggest using something like Matrix:Tag-AESEBUio and/or Matrix:Tag-SPDIFio or even Matrix:Tag-DIGITALio with additional note (TOS SPDIF AESEBU etc)
For instance many AudioScience cards support software selectable AESEBU or SPDIF for digital I/O. The connectors are XLR. They don't have RCA connectors.
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