Is the note that a string plays only a function of its tension? In other
words, could you use a single string gauge (assuming it doesn't just
break) for every note on the guitar? The reason I ask is that I was
looking at this 7-string guitar http://www.rondomusic.com/product3192.html
and it is setup like this:

String Gauge: 009, 011, 016, 024, 032, 042 and 056. Setup tuned to B, E, A, D, G, B, E
Sorry for the newbee question.

don