Intro and switch transient question

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Saying hi since this is my first post. I came here looking for tips on how to add a buffer preamp (vol and tone are still passive) to my bass.

Thanks to the great tips here, I was able to adapt the tillman/Hugsley preamp to my bass guitar and it works great. I added a switch so I could switch between passive and active. The 9v battery switch too (DPDT). I get a wicked pop when I switch from passive to active, any way to cure this? Note, I do not have the .1microfarad cap on the input to the JFET as shown in Hugley's layout, only a 3M resister. Would that fix it?

I'm sure the answer is simple but I haven't done electronics in a while and a quick search didn't help.

Thanks in advance.
 
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