Interesting article, but I can't help feeling that using a computer for this is unnecessarily complicated. I've been doing the same thing using a hi-fi CD recorder bought from my local Richer Sounds. They're not particularly expensive and slot neatly into a hi-fi system. You can also use it as a CD player if you haven't got space for both.
The only advantage I can see in using a computer is if you have software that eliminates surface noise from the record, but I'm not aware of any such software for RISC OS.