Hi Herman,
Debian installer already has tasksel. I propose two new tasks: a) Audio workstation b) Video workstation
It might be harder to separate these out in future, because many video tools have audio features, and some, like Open Movie Editor, are integrated with Jack transport. You might separate the tools slightly differently:
a) Music workstation - sequencers, synths, MIDI and score toolsb) Audiovisual workstation - capture tools, editors, processing, encoding and transcoding tools
My reasoning is that not all audio users are working with music, or making music from scratch.
Cheers! Daniel