Hi!
It seems you got no answer to all your other questions. So here are some
propositions:
Do you have another audio server (artsd etc.) running? This comes along with
guis.
Is your alsa running in the first place? Check at /proc/asound for more
details about driver state.
Fluidsynth: I only use it with jack (I still use 1.0.3, I don't know about
the latest version and the drivers...)
How did you start your jack before? I start it:
jackd -R -d alsa -d hw:3,0 -r 44100 (my card is 4th card in the system, only
nominally :-))
If you do it like that, all channels on your delta would be busy. If you can
define good pcm-devices (vai .asoundrc) you could only block part of your
channels. (I didn't manage that).
Try to check a few of these things... I hope I didn't tell you all the
things you knew already. If there are more specific questions, try the
alsa-user oder jack-mailingslists, they'd know more.
Kindest regards
Julien
--------
Music was my first love and it will be my last (John Miles)
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