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The touchpad toggle's notification was too loud, and the eight notify sounds varied by ~13 dB in RMS loudness — bug and fail came out two to three times louder than info or security.
I added a --silent flag to notify (shows the popup, plays no sound) and a NOTIFY_VOLUME knob (paplay scale, default 65536) so the master level can drop without re-encoding. toggle-touchpad now passes --silent on both enable and disable. normalize-notify-sounds.sh measures each .ogg and shifts it to a uniform -31 dB mean. It writes through the file instead of mv-ing over it, so the stow symlinks survive when the script runs against the live sound dir. I re-encoded all eight sounds to the new level.
Tests: a new tests/notify suite (12 tests) covers --silent, the volume knob, flag composition, and the error paths.
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