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Hi,
Regarding piezos there are no set rules - if you leave it in the case it may reduce the sound too much. If you use it bare many people use silicone mastic to fix it (I use serious glue which has a similar effect) so it dampens the pickup slightly because otherwise you pick up alot of unwanted noise (box rubbing against you for example). Best thing to do is try it both ways and see what your personal preference is. I buy mine off ebay UK (just search for piezo disc on ebay for example http://cgi.ebay.co.uk/5-35mm-Piezo-Elements-Sounder-Sensor-Trigger-... http://cgi.ebay.co.uk/5-27mm-Piezo-Elements-Sounder-Sensor-Trigger-...) and they come without a case with the 2 wires soldered on.
You do not need a volume control on your CBG - it just means you use the amp volume control instead.
Good luck,
David
The contact microphone idea is a good way to look at it. But I kind of think of it one step further. Whatever the Piezo is attached to is turned into a microphone.
On my first CBG I glued the Piezo to the back of the box. It worked. But it almost picks up more noise from the box rubbing against my clothes than it does from the strings. And feedback? Woah, if I turn the amp up loud enough to be heard over the raw sound of the strings it starts feeding back BAD.
On my second I didn't glue the Piezo at all, I just kind of wedged it between the neck and the top where I had relieved the neck to give the top room to vibrate freely. The result was MUCH better. The signal to the amp was much louder and cleaner, it picked up less noise from my hands on the box, and I can barely get it to feedback at all even with the amp cranked and the CBG right up in front of the speaker.
I just did some upgrades to the second CBG (still working #'s 3, 4 and 5 as well but progress has been slow since I've been having too much fun learning to play #2.) and in the process moved the piezo so it's still wedged between the neck and the top. But now it's wedged tighter, and directly under the bridge. Now it's working great. The signal is finally loud enough at the amp to get some good crunchy distortion (it's a real quick and dirty home made LM386 based amp built out of a cheap old surround sound speaker.) it picks up even less noise from my hand on the neck, and I can now induce feedback if I try - but don't get the incidental feedback of CBG #1.
On the other hand CBG#1 also works kind of nice as a grungy microphone if you scream at the back of it, and #2 that trick doesn't work at all.
I haven't really tried mounting with any kind of foam yet. And with how well the placement on #2 is working I don't see myself needing to experiment with foams and glues until I attempt a build that doesn't have a through neck I can use to wedge the piezo against the back of the bridge with.
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