...

Probably this should be the default behaviour for scalarphasor ?

Hmmm, well probably not, as this is a pain with low frequencies

yes. maybe reset phasor to 0 could update freq .. then you wouldn't always have to wait for phase.

this is .pd that i use to do this by scalar. it uses pitch (dx) and scale (x) for phasor freq, so phases from 0..x but only changes slope when you change dx.