Update clock.h to support uClock v2.2.1 and implement external PPQN 4 (#3)
Reviewed-on: https://git.pinkduck.xyz/adam/libGravity/pulls/3 Co-authored-by: Adam Wonak <adam.wonak@gmail.com> Co-committed-by: Adam Wonak <adam.wonak@gmail.com>
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