Output CV for modular synth (any help hugely appreciated)

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hi
newbie here.
but have been trying build controller modular synth involving piezo disks. concept code arduino send out given pwm voltage when piezo displacement reaches given threshold, go through lpf give me true dc voltage. wondering if theoretically possible , if send out pwm signal need connect digital pin output input of lpf , use analogwrite value between 0 255, or analogwrite need power source.
any hugely appreciated
thanks y'all  :)

quote
does analogwrite need power source.
no needs filter.

http://www.thebox.myzen.co.uk/tutorial/pwm.html


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