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/IF2108/pico_1bit_dac.uf2 # First Version & first Article, fs=48kHz Only, 1-bit 2nd Order Delta-Sigma
/IF2111/pico_1bit_dac_4844.uf2 # fs=44.1k/48kHz Support
/IF2112/pico_1bit_dac_NR.uf2 # Noise Reduced, 4-bit 3rd Order Delta-Sigma
/IF2204/pico_1bit_dac_HR.uf2 # High-resolution Support 
/IF2212/pico_1bit_dac_HR2.uf2 # High-resolution Support 2nd (Revised volume/Filter/Delta-sigma signal processing )