Thanks Ricardo. I've replaced jackd2 with jackd1 package.
Now jackd starts ok with command  "jackd -m -d alsa -p 256 -n 4 -P hw:0 -r -S 
48000" but when I start fluidsynth I get this error on jackd log:

subgraph starting at fluidsynth timed out (subgraph_wait_fd=9, status =
0, state = Triggered, pollret = 0 revents = 0x0)

and fluidsynth seems to start but whenever I try to play a midifile it
will not play anything because it's unable to allocate synthesis
processes.

Starting jackd in non-realtime mode (jackd -r -m -d alsa -p 256 -n 4 -P
hw:0 -r 48000) allows fluidsynth to connect, but then when I play some
midifile I only get mono sound on the right channel! (note that this is
not a mixer/muting issue because when playing a wav with aplay without
jackd I get stero sound. Moreover everything works well in Lucid).

For the moment I will stay with Lucid, but can someone with more
experience than me with jackd/fluidsynth on the Beagle post a working
example for Maverick or give some suggestions on how I can help to debug
the problem?

Btw, this is what works for me in Lucid.
jackd -m -d alsa -p 256 -n 4 -P hw:0 -S -r 48000
fluidsynth -a jack -r 48000 -c 16 -C 0 -R 0 -m alsa_seq -z 64 -j -l -o 
synth.polyphony=16 Unison.sf2

-- 
Jackd doesnt start on ARM Beagle board clone IGEPv2
https://bugs.launchpad.net/bugs/643626
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