Depends
Two ways that you can change the sound of an instrument are tuning or adjustment of the valves. Another way to change the sound of an instrument is to change your technique of blowing or bowing technique. I am sure there are more ways but here are some ideas!
that's a flute that has two ways of sound
Ear plugs and lowering the volume of sound
I could only find two...your ears and a microphone
Frequency (low or high sounds) and amplitude (loudness).
First is when there is another sound interfearence nearby, and other when something is blocking the path of sound.
sound waves are faster in water than in land, light waves are faster in land
Sound can be altered by changing the amplitude, which affects the volume of the sound, or by changing the frequency, which affects the pitch of the sound. Additionally, sound can be altered by applying effects such as reverb or distortion.
experimental and control groups
The ending '-ough' can sound two different ways. It can sound like an 'o' ending, such as in:doughthoughthrough (u sound)Or it can have an 'f' sound, like in:coughroughtough
-No Sound -A bit confuzing
Using the bow or plucking the string.