Try good mixcloud downloader that allows you to download radio audio from mixcloud.com
Mixcloud.com - Mixcloud is re-thinking radio. Listen to great radio shows, Podcasts and DJ mix sets on-demand.
SoundDownloader just download soundcloud and youtube audio. If you want to download mixcloud audio, try "HiDownload", it is a good mixcloud downloader which allow you to download radio audio from mixcloud.com