Count - you've really got me thinking now. I have dozens and dozens of basses but not one of them has a kill switch. I've never needed one when not gigging (noodling, practice, jam sessions) and when I was gigging I just muted with my tuner pedal between songs if needed. I suppose if you're wireless the kill switch before the transmitter would come in very handy. Am I missing something?
Well, maybe it's not for everyone. As far as signal considerations I don't have a very complex setup... if I use any pedal at all, it's a pre-type thing like a SansAmp VT pedal, if I think I need a little more 'stank' in my sound... I'm not into a lot of signal-chaining most of the time, so that's not an issue. But aside from silence for tuning, etc, I do play a few different gigs which present their respective reasons to use it:
At the reggae band ("Roots Reaction") gigs, our singer/keyboardist stops a lot between tunes to turn around and take a sip of his Guiness (which is annoying, he does it when the dance floor is full of revellers, leaving them to wait...), and sometimes we have technical issues- because that's the laid-back, not-very-together kind of thing that goes with that band. So the killswitch comes into play sometimes. Funny little outfit, but the music is good, and very organic. But I'm ready to quit every other week...
The quasi-jam-band/rock gig ("Angry Farmer") is a little like it in approach, but not nearly as awkward! Which is, you know, great.

But it's still a tad quirky, and little interruptions happen, which are worked into our performances. It's kind of a party band.
The rock-band-in-earnest ("Project Alice") is just starting up, but I find that for rehearsals the Killswitch is a great way to make sure I don't generate any distracting noise between tunes or while others are discussing a part, etc. I really hate when you're trying to deal with a bit and someone (the guitar player!) has a fit of right-hand-Tourettes syndrome

-- "BRRRRAAAANNNGGGG!!!". So for me, it's a handy way to make sure that at least
I can shut up! It's an easy reach to the killswitch...
I had a Peavey T-40 years ago that I did some severe remodeling to (ok, we'll just let that go...

), and one of the coolest parts of that hack-job was the killswitch I put in. I'd forgotten, until recently, after running across this Blackbird of mine, what a good idea I thought it was at the time. Mister Sixx was thinking on my page! Well, for a second...
