Held out of daf074f2 because the file was already in PLN's modified set and the
standing rule is not to commit over his uncommitted .tidal work. He waived it:
"commit over ouais je funk do the fix there too ill take it from there."

Same mechanical change as the other 254 files — the 7-line shadow stanza removed
so BootTidal.hs is the only definition:

    let gMask  = (midiOn "^41" (mask "t!3 <t!3 [f <t f>]>"))
    let gMute  = (midiOn "^73" (mask "f*16"))
    let gMute2 / gMute3
    let gM1 = gMask . gMute   /  gM2  /  gM3

`let width` and `let dMask` are untouched: BootTidal defines neither, and dMask
is this track's own compositional mask, not boilerplate.