For some reason my computer took real exception to this track. So a lot of this is guess work and cut and paste, I didn't get to do more of what I wanted. Anyway hope you like it! :)
Why do you need a tutorial? The audiotool tutorial was lretty good for me and I love the 303. Never transpose. Just write multiple patterns of four to eight steps each and chain them together to make a phrase. Turn the knobs for added fun. Route through a pulve with overdrive up to max for even more fun and use the filter lfo :-)
Yeah it is easy just arduous, and you have to use tuning a lot more than with other synths. I think the main way to make it easier is find the things to ignore. Like transposing down - it nearly never sounds good so I just don't even think about it.