MOTM

To the experts (which is most everyone here but me),

I working with a small circuit that I would like to add voltage control
(e.g., lfo, env.) through an attenuating pot.  When negative voltages
(e.g., from an lfo waveform) enter the circuit they 'screw things up'.  Is
there a "simple" way to restrict the incoming voltages to positive
voltages only?

Thanks, Jeff