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There is also an open-source project called TinyUSB that implements a USB Device stack on various ARM microcontrollers. However, its support for multichannel audio is limited because the processors themselves don't support multichannel audio directly. You'll have to use an external memory/interface bus on your chosen microcontroller and glue that to an FPGA to generate the I2S or TDM bus used to talk to the converters.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.