reproducers, remote lines, CD players and other audio equipment into one system. In the following text we describe the controls on the audio console shown in figure 13-7: l l l l l o l l l l Microphone  selector  buttons.   There  are  two identical   controls   for   the   operation   of microphones on the audio console (charnels one and two). CD  selector  buttons.  Charnels  three  and  four control   CD   players   one   and   two.   Because everything is read from left to right, CD one is selected  by  depressing  selector  button  number one  on  channel  three.  Selector  button  number two on channel four operates CD two. Reel-to-reel  (tape)  selector  buttons.  Tape one is programmed  through  selector  button  number  one on  channel  five  and  tape  two  through  selector button number two on charnel six. Cartridge   selector   buttons.   Three  cartridge machines  are  programmed  through  charnels seven, eight and nine. AFRTS/network selector buttons.  Channel  10 receives  audio  originating  from  the  AFRTS Broadcast   Center   (BC)   and   major   radio networks. Output selector buttons.  All 10 channels on this audio  console  have  the  following  two  output options: audition and program. Mode keys. This key has three positions. When a  sound  source  is  not  being  used,  the  key  is maintained in the neutral (off) position. Pushing the key up into the audition/program buss places your sound source on the air. Moving the key into the  cue  position  allows  you  to  hear  the  source only in the studio and not on the air. Cue/intercom selector. This selector allows you to  cue  a  sound  source  over  the  cue  speaker  or permits  broadcasters  to  communicate  between studios. Cue  gain  control.  This  control  regulates  the volume of the cue speaker. Headphone   selector.   This  control  is  used  to select the audio source that is heard through the headphones.  The  three  positions  are  audition, program and cue. Figure  13-8.—Audiotape  cartridge  and  cartridge  playback l l l l machine. Headphone gain control.  The headphone gain control  is  located  immediately  below  the headphone  selector.  Set  this  level  to  hear  your program sound source clearly, but not at a point where sounds within the studio are drowned out. Monitor selector switch.  The monitor selector switch  is  used  to  select  which  audio  source  is heard on the “air” monitor speakers located in the studio.  The  three  positions  are  audition,  program and  air. Monitor gain control.  This  control  regulates  the volume-of  the  monitor  speakers. Audition/program  master  gain  controls.  DO NOT  ADJUST  THESE  CONTROLS!   They control the output of the entire audio console and are set by the station engineers. 13-26