(1) A type of equalizer for attenuating selected frequencies from a sounds signal spectrum. For example, a lowpass filter passes lower frequencies and removes the higher frequencies. By raising or lowering the filter rolloff frequency parameter, a sound will be made brighter or darker.

(2) A device or MIDI software filter that eliminates selected messages from the MIDI data stream, usually called MIDI filtering by data thinning. See also running status.

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