buffering switches

We're putting together some guitar FX pedals and having great problems in retaining true bypass without excessive switching noise. My thought was to use an arduino mini to smotthly lower the voltage/signal momentarily while the switch or relay operated, a kind of FET switch, in effect. The pop is caused by a drop in the voltage when the switch or relay is activated.

Any thoughts appreciated.

A capacitor?

As shown here in my quick search:

Smoothing Caps on FX pedal switchboard thingy.

caps reduce it but there's still an audible click ;(

Is your circuit just like this?