It sounds to me like everything is too loud. I'm not an expert in any way, but its the effect you get in Audition/Cool Edit when you amplifiy too far and the sound wave goes orange.
It's definitely NOT, 100% NOT, just a 'low quality DAB bitrate' thing. I hope they realise people are not moaning about SDL2, poor coverage or the low bitrate - its a processing problem that really needs sorting asap.