Thanks, Dave. Hmm. I've given up and just listened to the programme on speakers - and if it levelled out the sound, the Audacity amplification would certainly have spoiled it, as it uses different levels of sound woven in through each other to create an extraordinary effect.

However, the next one I'm listening to isn't so fancy; I'll try it on that.

Thanks for all this great help, everyone, it's so useful.