til: get rid of the partial knobs implementation

With taps more or less fully implemented, it seems appropriate to
get rid of the stubbed out knobs for now.

Taps don't express the same things about range and usage knobs
aspired towards, but they don't preclude adding such things
either.  But it seems clear that the way knobs were stubbed won't
be complementing taps as things stand currently to add those
aspects.

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