I've been researching different envelope filters for months & it actually inspired me to put together a proper pedal board. I finally spotted a good enough deal & pulled the trigger on a Xotic Robotalk 2. A few days later I received the pedal & plugged it in. It seems it needs a lot of signal in order to get the envelope to open. So much so, my Precision doesn't provide enough, nor does my Stingray & that's with the sensitivity all the way up. It works quite well with my Yamaha DX7 though, which have so much signal, the dip switch needs tweaked to accommodate the signal. The only way I can get the envelope to sound it by playing very hard near the bridge, which is two or three times harder than I typically play, or slap the string, which I don't do, have no intention of using that style. Is this the nature of ALL envelope filters?