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It's not all that difficult to make a starter. It's just that it gets better with age. I started this one almost 30 years ago. To make your own, all it takes is flour, water and some time. Just mix a cup of warm water with a cup of flour and let it set for a week stirring once or twice a day.
I highly recommend EVERYONE try this stuff! It's great. I've got the Galic and the Smoked, and can't tell which one I like better.
Re: the "sour" I think you just have to play with it. I leave mine out on the counter most of the time which I think is making a difference.
... we gotta remember, Bassman only has about a 25 year head start on us!!! YES, this stuff does get better with age. I've had mine now since 3/10/10... I know that because I sharpied it on the top of the mason jar I keep it in. I too like the twang of sourdough and mine is slowly getting there. I've also heard and tried adding a little more sugar/honey to the sponge affects the twang. I've been playing with that, but still haven't gotten to Bassman's stage yet.
Patience, Grasshopper, PATIENCE!
Bassman is one heck of a cool dude to share this - take advantage of it!