Morse Code in Overture

[Porcupine]

I have changed

<Sound Volume="1.000000" UseSoundHardware="true" MaxSoundChannels="32" StreamUpdateFreq="10" UseThreading="true" MaxMonoChannelsHint="0" MaxStereoChannelsHint="0" />

in various ways as you suggested, but even with

<Sound Volume="1.000000" UseSoundHardware="true" MaxSoundChannels="10" StreamUpdateFreq="10" UseThreading="false" MaxMonoChannelsHint="8" MaxStereoChannelsHint="2" />

there is no morse beeping to be heard. Then I tried other sounds from the directory
/Applications/Penumbra Collection/Overture/sounds/lead_mine
and that seemed to work:
mv lm_morse_short1.ogg lm_morse_short1.ogg.orig
cp lm_gen_light_on1.ogg lm_morse_short1.ogg
mv lm_morse_long1.ogg lm_morse_long1.ogg.orig
cp lm_digger_start1.ogg lm_morse_long1.ogg
chmod a+r *
Now I do hear noises from the radio. For some reason the morse ogg-files won't play?!
That is weird. What other sounds have I missed in the game so far??

BTW, I'm using an iMac with Snow Leopard.