the denser the medium the lower the pitch
pitch corresponds directly with frequency, so as frequency increases, so does pitch.
i think it just vibrates
Pitch
pitch isn't used to find sound but pitch is if the sound is loud or soft. the pitch of music may vary.
yea
it is caused when the variation is hit on the guitar
Perhaps you mean monotone, something which produces sounds which do not vary in pitch.
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increase the freguency of the wave
Yes. Pitch controls allow you to vary the speed the vinyl spins at, very precisely.
Because the pitch can vary by hitting a drum harder or softer, or by playing a stroke away from the center of the skin.