Since Avid already have the source code for the ProControl & Control|24 surely the process of recompiling the code for 64-bit would be pretty straightforward, especially since Apple have already documented the process for developers and provide direct help.
Apple write about recompiling code to 64-bit:
https://developer.apple.com/library/...ndDrivers.html
Quote:
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"As a driver developer, you must update your drivers with 64-bit binaries. The 64-bit kernel cannot load 32-bit kernel extensions. Fortunately, because the I/O Kit is a relatively modern environment with few legacy design constraints, most kernel extensions can be adapted fairly easily to 64-bit. Many drivers “just work” after changing the compile settings. However, there are a few steps you must take along the way."
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