Soundwaves still travel underwater, so while the xrisora do not have the exact same kind of vocal chords as humans do, they produce a wide variety of sounds (clicks, whistles, pulses and songs) at a far wider range of frequencies that humans can hear. As the team are equipped with the earpieces, those will translate the speech of the xrisora so that the team will be able to understand them — their own speech will sound normal (again because of the earpiece), but due to their changed bodies, they are actually speaking the same way the xrisora are and can thus be understood.
As for instruments, there is a nice range of percussion-type instruments, and instruments like a marimba, where the sound of the keys being hit again carries through water to produce different melodies.
And finally, as you may have guessed, as whistling is a type of communication among the xrisora, whistling without it meaning something is not possible.
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Soundwaves still travel underwater, so while the xrisora do not have the exact same kind of vocal chords as humans do, they produce a wide variety of sounds (clicks, whistles, pulses and songs) at a far wider range of frequencies that humans can hear. As the team are equipped with the earpieces, those will translate the speech of the xrisora so that the team will be able to understand them — their own speech will sound normal (again because of the earpiece), but due to their changed bodies, they are actually speaking the same way the xrisora are and can thus be understood.
As for instruments, there is a nice range of percussion-type instruments, and instruments like a marimba, where the sound of the keys being hit again carries through water to produce different melodies.
And finally, as you may have guessed, as whistling is a type of communication among the xrisora, whistling without it meaning something is not possible.