Filtering either eliminates or emphasizes frequencies. It can change the harmonics present, which changes the timbre (tone). One example is a low pass filter. This filter lets everything below a specific frequency to pass through. Another one is a high pass filter. It lets everything above a certain frequency to pass through. Lastly is a notch (band-pass) filter. It blocks out very specific parts. Filters can be modified and affected by envelopes and low frequncy oscillation.
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