zircon has a good tutorial on synths, which includes links to free synths. Another good place to find synths (or just about anything else) is www.kvraudio.com.
EDIT: here's Andy's synth tutorial
If you're creative with how you sequence it (ie finding ways to fake all the appropriate dynamics) and have a good distortion (ie one designed as a distortion/amp modeler for real guitars, rather than one designed for synths -- if you don't want to spend money, I reccomend Guitar Suite), it can be done acceptably. But really the only way to make it sound like a real guitar is to have a real guitar.
If you want a guitarrist, I reccomend checking out the live performers database.
I wasn't counting levels, but I got to a room with three darknuts, with all my bottles empty, my rupee supply almost empty (ie no magic armor), and a heart and a half remaining. Needless to say, I got pwnt.
So how about that ball and chain. Is that one bitchin' item or what?
I think one of the things this game does very well is play with your expectations. The Snowpeak mansion is a perfect example of this; that's simply not remotely like what you'd expect a Zelda dungeon to be, yet it works brilliantly and has some great puzzles. Even the item plays with your expectations; you know you gotta get through a lot of the ice, but you expect fire arrows or a fire rod or some other such thing to let you melt them. The ball and chain is a complete surprise.
The spinner is another example; completely unlike any previous Zelda item, but it works so well, and they designed one seriously bitchin' dungeon around it.
[08:12] <FiremanJoe> Sorry guys, I'm having some pretty bad network/connection problems
[08:15] <FiremanJoe> I think I'm gonna have to withdraw from the comp
EDIT: just beat Kamoh 3-0
I can never get the fucking Helm Splitter to work, because whenever I try to do a Shield Thrust, I always end up doing a Spin Attack. Which really blows cock.