[sdiy] pcb layout help

[Nrthrnsol at aol.com]

hey guys
i am looking at this pcb layout
http://bryant02.home.att.net/pcbs/screamingbirdlayout.gif
and still being a beginner 
i have a few questions

where does the 9V ground connect to?
where does the volume connect?
i see the output ground but where does the other output part connect to?

any ideas?

thanks
johnny
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