The Radio stations need some kind of sliders or controls to adjust the overall station.
#1 should be Adventurousness -- I think this is the biggest one missing. For my tastes, Spotify Radio based on a playlist or an artist plays way too many "fringe" or "unknown" tracks. But probably other people like that. It would be super-easy to let this be customizable. It should be trivial, given the EchoNest API.
My #2 is for Playlist stations -- a setting for "how much to play from the current playlist." Right now I can never tell if I will get any songs from my current playlist. Sometimes I want 50/50 playlist songs and not-playlist songs, sometimes I want something else. This should be a simple addition as well.
Your idea has been submitted a while ago but unfortunately hasn't gathered enough kudos (25 per year). In order to keep an overview of the active ideas in this forum, we will close this idea for now. However this does not mean that your idea has been declined by Spotify.
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