I have released an opcode for CMask in the csound-extended repository.
This is for Ubuntu (and probably any Debian) and is just the binary
opcode library. Sources are available in the csound-extended
repository.

You can download this from here:
https://github.com/gogins/csound-extended/releases/tag/v0.1.1

Regards,
Mike

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Michael Gogins
Irreducible Productions
http://michaelgogins.tumblr.com