According to the spec...

For alGetListenerf there is only AL_GAIN
For alGetListener3f / alGetListenerfv there is only AL_POSITION, AL_ORIENTATION and AL_VELOCITY
For alGetSourcefv there is AL_POSITION, AL_VELOCITY and AL_DIRECTION  (we're missing velocity for source doppler, but I can add a stub for it)

The log statement was duplicated from the existing code, but I'll change it if thats whats preferred.