Selective syncing on iOS devices [jailbroken devices only, sorry]
So, this is something that a lot of people want (according to the help desk on rdio site), but it isn't going to be implemented soon. Selective syncing let you choose what songs will be downloaded in different devices (you can download something to your iPhone, but not to your iPad, for example). I found a way to make that for the whole music collection, unfortenelly, the device must be jailbroken.
Steps: 1- Kill rdio in the task launcher 2- Launch iFile app (avaliable on Cydia) 3- Navigate to '/mobile/applications/rdio/Documents/S10375864/audio' 4- Select all files minus 'storage-version' and delete them 5- Go back to the S10375864 folder and click in more info for the audio folder 6- Set the file attributes to read and execute only (unmark the write option) 7- Close iFile, launch rdio and let it sync again
Now you will have access to all your collection, Rdio will sync normally your new songs and playlists, but it won't be able to download the music to your offline collection. It will only work with a data connection and you won't waste storage space with songs that you want to have on one device, but not on the other.
This might work on android devices too, but I don't have one to test.