This is planned for one of the upcoming updates.Option to detect participations from other artists (feat)... we really miss it, this promise is old.
Please check the Logs section to see if there are any error messages.It appear the repeat rules are not working at all. Even the old ones. I have opened a ticket. We're having multiple songs play when they shouldn't.
This will take some time to implement. Currently we add only the most requested features, mostly improving what we already have, instead of adding new half-baked features.Like a Playlist generator and voice tracking on the cloud.