Interesting process but I strongly disagree with "don't record anything at all"! I find that some pretty interesting melodies happen largely by accident and not capturing them does not mean they were no good rather it means that I failed to capture them for later improvement. Didn't McCartney have a story about Yesterday just coming to him and he worried that it must be something he had heard and accidentally nicked? What a shame if he'd let it go and never managed to get it back!