Brooks Cinema RM 909 ADSR

The letters A, D, S &R are the first letters of: Attack, Decay, Sustain and Release. These are the various elements of volume changes in the sounding of a keyboard instrument.

Ground Adapter Plug
Adapts a three pronged electrical plug to a two pronged wall outlet. This bypasses the ground and may create a hum in the system. A lack of a good ground can cause mild electrical shock when touching a microphone.

Brooks Cinema ZL 44 Flutter
1) High-frequency variations in pitch of a recorded waveform due to fast speed variations in a recorder or playback machine.
2) Originally, and more formally, any variations (fast or slow) in pitch of a recorded tone due to speed fluctuations in a recorder or playback unit.

Amplification
An increasing of signal strength.

Brooks KS-55 Keying Input (Key Input)
An input on a dynamics processing device to control the device by an external audio signal.

High Impedance
Impedance of 5000 or more ohms.

Hi-Z
An abbreviation of the term High Impedance (Impedance of 5000 or more ohms).

Balls
1) The depth and thickness of a sound, usually on the bottom end of the EQ (as in "needs more balls"). 2) The strength of the voice on the mic (as in "check it like you have some balls").