It might look ugly now, but I now have the frequency setting working on Mac OS X. I am using the excellent cross platform USB HID library here: http://www.signal11.us/oss/hidapi/
Unusually for cross platform system libraries, it’s actually easier to use than natively trying to hack the API directly.
One slight “feature” was that there’s a 64 bit incompatibility in the library in the get_long_property function where it assumes the C “long” datatype is 32 bits which I fixed.
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