Rich entries for the afternoon that turned the LCXL from a lookup into a channel
strip. Written for a cold reader, because these are the blog/video source material.
The four findings worth reading again months from now:
* A daemon with THREE possible lifecycles, two of which could run at once — two
processes writing SysEx to one board, fighting over every LED, neither wrong
enough to look broken.
* `StartLimitIntervalSec=0` in [Service] instead of [Unit]: systemd logs "Unknown
key ... ignoring" and the default retry limit stays in force. A silent failure one
section heading away from working.
* 34 "destination already taken" clashes that were entirely PHANTOM — an artefact of
costing a permutation one move at a time when the corpus is uniformly off by one.
* A measurement that overruled my own design: I proposed eight per-column DJ
filters; measuring which orbits actually receive gF1/gF2/gF3 showed they are
per-FAMILY (drums / bass / leads) and consistent across all 13 tracks. Building
the "better" design would have destroyed a working abstraction.
Also: the physical LCXL faders sat at 0 while the Ardour faders had been raised by
mouse — silent divergence, and the next brush of a fader would have killed the orbit
mid-set. Found in a log, not by ear.
