# cp -a sound/usb/snd-usb-audio.ko /lib/modules/x.y. DEP problems - just run this shortly to get scripts/recordmcount compiled and once passed, CTRL-C # cp /usr/src/linux-headers-x.y.z-n/Module.symvers. # apt-get install build-essential linux-source-x.y linux-headers-amd64 But, if DSD and player are not important, I believe, that coax input with quality feeding source, ceteris paribus, will be better. USB input, in comparison with coax input, has two advantages: DSD and possibility to use Teac HR Audio Player. NEEDED PACKAGES (replace x.y.z-n in context and switch between amd64 or i386 if needed) Here is a question in 501's inputs quality and in quality of feeding source. Under debian, you will only need to recompile the kernel module: The patch is small and generic, tested on kernel 4.3.0 and current mainline 4.4, should work on every >=3.x with some ajustement in lines. – seamless switch between format/rate or PCM/DSD mode. TEAC also packed this incredible unit with two 32-bit BurrBrown DACs per channel and JRC MUSES op amps, dual monaural design, fully balanced XLR as well as unbalanced RCA outputs and a toroidal-core power supply. After my tests, it seems quite similar to the patch for the “Playback Design” products. TEAC's new UD-501 is the star of the 501 series.The UD-501 supports DSD 2.8/5.6MHZ file native playback by ASIO 2.1 or DoP methods or up to 32bit/384kHz PCM. So, here is a patch i have make this morning to correct these bugs with these high-end/high-rec dacs and allow bit-perfect mode. Error i never took time to check because it was working. I was also getting the same “clock source 41 is not valid, cannot use” as the UD-501. I bought a fresh Teac UD-503 yesterday and it was driving me crazy last evening, always disconnecting/freezing when switching from S16 to S32 format, or simply changing file rate. Patch accepted in upstream sound, should be in next 4.5-rc2 and next stable vanilla kernel starting from 4.5.
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