I see what you're getting at.

Wendy filters will almost do what you're asking for, although in order to do it on the fly, you'd need to be able to activate more than one Wendy filter at a time, which I'm not sure is possible. It would be possible to set up combinations ahead of time (make a separate Wendy filter for slow+instrumental+jazz for example), but I don't know if you can activate more than one Wendy filter at a time on-the-fly. Hugo/Mike/Rob?

(PS: Maybe I shouldn't talk about upcoming 1.1 features on the BBS? But Wendy filters are a feature that's already been discussed publicly. I just wondered if they would do what he was asking for.)

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Tony Fabris