I would ask Motu directly since the don't always announce newly introduced limitations.

Ultralite AVB used to have selectable numbers of USB-channels inĀ  class compliant mode and the manual still says so but later firmwares limits the numbers to 32.
Old firmwares can be used but I have no idea about M64

Let Motu know that this is a dealbreaker at least.

Regards, Anders Hellquist

Den tors 30 jan. 2020 kl 15:26 skrev Peter P. <peterparker@fastmail.com>:
Hi list,

does anyone have experience using the Motu M64
https://motu.com/products/avb/m64/specs.html
as class compliant interface under linux and can confirm that all 64
channels are working in duplex mode?

The list archive didn't give a positive result.

Thanks, P
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