Endgame is $40. Remember, the meta is to run your R2R in 1bit mode and have SoX output DSD256.
sox -t waveaudio "Stereo Mix" -t waveaudio 1 rate -v 11289600 sdm -f clans-6 -t 4 -n 4 \
equalizer 21 1.5q 1 \
equalizer 84 -0.4q 1.1 \
equalizer 200 -2.2q 0.8 \
equalizer 1000 1.4q 0.6 \
equalizer 3700 -1.6q 3.8 \
equalizer 5600 2.6q 1.8 \
gain -2.5818