Brooks Cinema xm 808 Amplifier (Power amp, Head)

It's the part of the sound system that actually magnifies or "amplifies" the sound. In other words, it makes stuff louder.

Half Step
A pitch difference of the amount that is present between adjacent keys on a piano.

Brooks KM 77 Foot Pedal
1) An effects device where the amount of the effect can be controlled by a musician with his foot.
2) The beater mechanism of a foot drum that is activated by the drummer's foot to play the drum.
3) Any device, like a volume control, that can be operated by the foot.

Joystick
1) A quad pan pot which distributes what percentage of on signal is sent to each of 4 outputs.
2) A control that is separately controlling two functions at one time.

Brooks TM-22 Frequency Response
How sensitive an electronic device (mic, amplifier, speaker, etc.) is to various frequencies; often communicated with a graph.

Balance
1) The relative level of two or more instruments in a mix, or the relative level of audio signals in the channels of a stereo recording. 2) To make the relative levels of audio signals in the channels of a stereo recording even.

Chorus
1) The part of The song that is repeated and has the same music and lyrics each time; the chorus will usually give the point of the song.
2) A musical singing group that has many singers.
3) A delay effect that simulates a vocal chorus by adding several delays with a mild amount of feedback and a medium amount of depth.
4) A similar effect created in some synthesizers by detuning (reducing the pitch of, slightly) and mixing it with the signal that has regular tuning and with a slight delay.

Boom
1) A hand-held, telescoping pole used to hold the microphone in recording dialogue in film production.
2) A telescoping support arm that is attached to a microphone stand and which holds the microphone. 3) Loosely, a boomstand.