Making ground

[[22Hz] Productions]

	Ok.. I've got my simple lil' oscillator working (well, not anymore, 
but I know I had it at one point, so I'm sure I can build another) and I 
got the ringmod thang working... But I have a silly little question. I 
am(was) using 2 9v batteries to make +/-9v and ground.. + terminal from 
one and - terminal from the other, with the 2 leftover terms as a 
ground.. This worked great, but.. I'd like to keep the circuit to 1 9v 
battery, please. Is there any way to do this? Hell, things run off of 9v 
batteries all the time (stomp boxes, et al), how do they do it? Thanks 
for any help.. (Now why won't this *!#^(#$*^ thing work... argh.) 

	Jason