have a look at [phasorshot~] (externals / tof - include in pd-extended 
with [import tof]). it does exactly what you want.

from the help file:

phasorshot~ is exactly like a phasor except that you can
disabling it's looping, therefore making it a one shot
lookup signal.

Of course line~ does something similar, but with
phasorshot~ you can change the speed DURING the ramp.

pat

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