Thanks for all the advice,
I think I'll go with the Korg NanoKontrol for now unless I can find a
cheap Oxygen 8. The Behringer bcf2000's overkill for me - I just need a
few knobs for effects and synth parameters. If I'm going to spend that
much I'd rather have a second keyboard than extra CC's.
I found a good french site with a list of midi controls that work in linux:
http://www.linuxmao.org/tikiwiki/tiki-index.php?page=Les+surfaces+de+contr%…
Les surface de controle fonctionnant sous Linux
(liste non-exhaustive à compléter par vos expériences)
* Berhinger BFC et BRC 2000
* Evolution UC16
* Evolution UC33
* M-audio Oxygen 8
* M-audio Oxygen49 fonctionne sans probleme
* Novation Remote25
* Vestax VCI-100
* Korg NanoKontrol (éditeur testé sous wine et ubuntu, aucun problème)
* Akai MPD24
* KORG M3 reconnu en USB