View a dB-valued Param as the model's FaderScale — the fader's
value IS dB, so position→dB is fromNorm and dB→position is toNorm. Lets the
per-desk fader scale be expressed as one canonical Param. (Was a duplicated
FaderScaleLike shape; the model's own type is the one vocabulary.)
View a dB-valued Param as the model's FaderScale — the fader's value IS dB, so position→dB is
fromNormand dB→position istoNorm. Lets the per-desk fader scale be expressed as one canonicalParam. (Was a duplicatedFaderScaleLikeshape; the model's own type is the one vocabulary.)