HID FX sensor 
Advise from Derek Holzer

Built it modular
First build the FX then once it sounds the way you want, build the control system for it. For reverb, I use the freeverb~ external. No sense in trying
to build your own. For the delay I use the one from Xjimmies.

Play with each alone, just with your voice as the sound source, till you find
the settings you want. Then start to think about how the sensor will control this.

First step is to get a range of numbers that creates the changes in the FX.
Scale the input from the light sensor to that range of numbers
and you're there!

Some suggestions for parameters that the light sensor could
change: 1) Delay time 2) Delay feedback 3) Amount of sound sent from mic
to effects4) etc etc

Focus on getting the effects right first.

E.g. light sensor control a crossfader,
as it gets darker more sounds from the mic go to the effects and less
to the main outs, and as it gets brighter more goes to the main outs and less
to the effects.