I found a solution!
In the osgAL multiple sounds example's createSound function, the
allocateSource function needs to be called before setPlay instead of after
setPlay. The allocateSource funciton is important, since it allocates a
hardware soundsource for each sound being added to the scenegraph.
Anyway, here is how the fixed code looks in createSound. This is at or near
line 386 in osgalmultiple.cpp:
osg::ref_ptr<osgAL::SoundState> sound_state = new
osgAL::SoundState(file);
sound_state->setSample(sample.get());
sound_state->setGain(1.0f);
sound_state->setReferenceDistance(60);
sound_state->setRolloffFactor(3);
sound_state->allocateSource(10);
sound_state->setPlay(true);
sound_state->setLooping(true);
The two sounds now play simultaneously, as intended.
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