I heartily encourage you or someone to create a list of USB DAC supported by CyanogenMod.
I will restrict myself to stock flagship smartphones: most people used to use stock devices, and Samsung’s flagship smartphones are most popular at the moment.
And I personnally avoid using devices like Nexus devices that don’t have an external memory card slot to store my preferred music so that it can be accessible anywhere, anytime.
I actually think there shouldn't be a list of DAC's supported by CM, simply because putting CM on your phone involves unlocking bootloader and what not, and IMHO, if someone comes here trying to find out if their phone (or a phone) will work with their USB DAC, but not stock ,they should ask, learn and research before doing something like unlocking the bootloader and rooting, including plenty of reading on XDA.
I think DanBa's list as is is great and well-appreciated, except, as I've mentioned before, the suggestion that I think the list should take into account different versions of phones. It's not enough to simply say "stock Note 2" supports something because there are different versions of "stock Note 2", some with different CPUs, and depending on which version you have, you may not have the functionality the list says you should if you have "stock Note 2."