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VSU: fix modmask triggering for every channel#148

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skyfloogle wants to merge 1 commit intoValleyBell:masterfrom
skyfloogle:fix-vsu-bug
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VSU: fix modmask triggering for every channel#148
skyfloogle wants to merge 1 commit intoValleyBell:masterfrom
skyfloogle:fix-vsu-bug

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@skyfloogle skyfloogle commented Mar 1, 2026

This pull request fixes a bug I introduced in #142. I implemented a hardware bug where writing to S5FQL or S5FQH locks the corresponding byte of the frequency value. In my initial implementation, however, this triggered when writing the FQL or FQH registers of any channel, not just channel 5.

Reproducing sample with before/after/hardware (may not be pleasant to listen to):
repro.zip

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