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2. Control knob - Wikipedia

   en.wikipedia.org/wiki/Control_knob

   Two control knobs for a heating/cooling system. The left knob controls the temperature while the right controls the fan speed. A control knob is a rotary device used to provide manual input adjustments to a mechanical/electrical system when grasped and turned by a human operator, so that differing extent of knob rotation corresponds to different desired input.

3. Audio equipment - Wikipedia

   en.wikipedia.org/wiki/Audio_equipment

   Audio equipment is widely used in many different scenarios, such as concerts, bars, meeting rooms and the home where there is a need to reproduce, record and enhance sound volume. Electronic circuits considered a part of audio electronics may also be designed to achieve certain signal processing operations, in order to make particular ...

4. Input device - Wikipedia

   en.wikipedia.org/wiki/Input_device

   A common computer input device, a keyboard. A user presses a key which transfers information to a computer. In computing, an input device is a piece of equipment used to provide data and control signals to an information processing system, such as a computer or information appliance.

5. Potentiometer - Wikipedia

   en.wikipedia.org/wiki/Potentiometer

   The 'log pot', that is, a potentiometer has a resistance, taper, or, "curve" (or law) of a logarithmic (log) form, is used as the volume control in audio power amplifiers, where it is also called an "audio taper pot", because the amplitude response of the human ear is approximately logarithmic. It ensures that on a volume control marked 0 to 10 ...

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7. MIDI controller - Wikipedia

   en.wikipedia.org/wiki/MIDI_controller

   The original MIDI specification included 128 virtual controller numbers for real-time modifications to live instruments or their audio. MIDI Show Control (MSC) and MIDI Machine Control (MMC) are two separate extensions of the original MIDI spec, expanding MIDI protocol to accept far more than its original intentions.