Brooks RM 909 reviews Clock Signal

The signal put out by a circuit that generates steady even pulses or steady codes used for synchronization.

Guitar Processor
A unit that will add effects to a direct guitar signal, including a simulated instrument amplifier sound and (often) delay and reverb effects.

Brooks HI FI projectors Hall Program
A setting of a digital delay/reverb effects unit that approximates concert halls. Hall programs are characterized by pre-delay of up to 25 ms.

Ground
In electronics, a place (terminal) that has zero volts.

Brooks Hi Fi speakers Cue
1) The signal fed back to the musicians through headphones.
2) To set the tape or disc so that the intended selection will immediately play when the tape machine or player is started.
3) A location point entered into a computer controlling the playback or recording of a track or tape.
4) In MCI brand tape machines, a term meaning the same thing as Sync Playback (where the record head is used as a playback head for those tracks already recorded).

Line In (Input, return)
Where a signal enters the board or component.

AC
1) Abbreviation for alternating current.
2) An abbreviation of the term Alternating Current (electric current which flows back and forth in a circuit; all studio signals running through audio lines are AC).

Circuit
1) One complete path of electric current.
2) Similar to definition 1, but including all paths and components to accomplish one function in a device.