I'd have to transpose all the stuff I now have for an F alto. Hmm. Thoughts, anyone?
Unsurprisingly - you could try the Audiveris software! I think with a bit more work in terms of learning how to use the software better, it could make transposing really quick and easy. I tried it this morning with my copy of The Division Flute, which is for alto. I scanned a page to pdf and imported that into Audiveris and hit the go button. It's a pleasure to watch: you see the pdf on screen and the software goes over it and superimposes (in green) all the things it finds: clefs, bar lines, notes etc. It doesn't take long and when it's finished you can see how accurate it has been. I'd guess it was about 90% correct. There was one bar that cropped up here and there and it got it wrong every time for some reason, most of the rest was fine. So, almost done about 5 mins after taking the book off the shelf. That brought me to the point where I need to be more familiar with the software: you can click on things it's missed and I believe you can fix them manually which should be quick and easy, but I don't know how to do it. I exported it to xml and imported that into LilyPond and fixed it there, but it was much slower because it wasn't so easy to see what the errors were. I'll have another go at it tomorrow.
I presume there is virtually nothing scored for a G instrument so I suppose you are almost always going to have to either transpose or, for solo works, just play it with C or F fingerings.
I take it the website is legit? I don't think I've come across it before.
I have never used it, sorry. I have been aware of it for a while, though that doesn't mean a great deal.