There is no sound in outer space. Volume or loudness is related to the amplitude of a sound wave. Loudness is a perceptual response to the physical property of intensity.
Pitch is related to the frequency of a sound wave.
Humans are capable of hearing sounds between 20 Hz and 20,000 Hz under normal circumstances. Sounds with frequencies above 20,000 Hz are called ultrasound Sounds with frequencies below 20 Hz are called infrasound. Phase differences are one way we localize sounds. Sounds in one ear will be louder than the other. As with any wave the speed of sound depends on the medium in which it is propagating.