[LAU] SO-666 crashes Ardour

I'm trying to use the drone synth plugin SO-666 with Ardour

I installed it from the KXStudio repo
but when I load one into Ardour the app crashes - as in: completely
shuts down

I also tried Qtractor to see if this was any more forgiving but it did
the same thing

I also tried the other two plugs SO-KL5 & SO-404 in both applications -
same thing again

here is the error message from my syslog:

Mar 10 08:36:16 kim-studio kernel: ardour-2.8.11[4577]: segfault at 10
ip ad650dc1 sp accd4b10 error 4 in libsosynth.so[ad650000+3000]

anyone else experience this?

my config is below:

-- 
*my Linux audio perf config:*
Dell Studio 1537 Core2 Duo @2.0GHz | 3G-RAM
Ubuntu 10.10
kernel 2.6.37-1.dmz.2-liquorix-686 #1 ZEN SMP PREEMPT
jackd version jackdmp 1.9.6
Ardour 2.8.11
Pd version 0.42.5-extended
USB iMic audio interface
Korg nanoKontrol
M-Audio kbd Axiom25
cpufreq-set - both cpu's are set to 2.0GHz and performance
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