[Fluxus] start-audio crashes

[Stefano Sabatini]

Hi all,

I'm following the fluxus-documentation tutorial, and I can't get
start-audio working without to crash.

I'm running jackd and a readable client connected to jack with ID 
metro1:120_bpm and invoking the command:
(start-audio "metro1:120_bpm" 256 44100)

which causes fluxus to crash every time, while the metro readable
client got zombified:

stefano at geppetto ~/s/S/C/libjack> metro --name metro1 -b 120 -d 0.2 -f 4000
jack_client_thread zombified - exiting from JACK

and this is fluxus bt:
(gdb) bt
#0  0xb7f9f424 in __kernel_vsyscall ()
#1  0xb747e640 in raise () from /lib/i686/cmov/libc.so.6
#2  0xb7480018 in abort () from /lib/i686/cmov/libc.so.6
#3  0xb7df9375 in fault_handler () from /usr/lib/libmzscheme3m-4.0.1.so
#4  <signal handler called>
#5  0xb7b36d7f in jack_thread_wait () from /usr/lib/libjack.so.0
#6  0xb7b36f9e in ?? () from /usr/lib/libjack.so.0
#7  0x0866aba0 in ?? ()
#8  0x00000000 in ?? ()

I'm using fluxus git of the day, but I was getting the very same
problem with an old version (December 2008) of fluxus.

Suggestions are welcome, the crash seems rooted in libmzscheme3m, so
maybe it could depend by that lib version.

Any suggestion is welcome.

Regards.