Phone Recording Setup - Mixing Bench

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  • The Audio Mixing Benches have a phone hybrid that can be used to record phone calls.
  • Long distance calls can not be made on the phones. Caller would need to call in.


  1. Patch Hybrid Out (C15) to Mic/Line CH2 (B16).
  2. Patch Aux Send 1 (A21) to Hybrid In (D15).


Set up
  • Plug your mic into the XLR input of channel 1 of the mixer.
  • The phone hybrid output is on channel 2.
  • Turn the Aux 1 Master to 12 o’clock.
  • In the Source section select Main Mix.
  • Plug the headphones into the mixer headphone jack.
  • Adjust headphone levels as needed on the mixer.
  • Pan channel 1 to the left and chanel 2 to the right.
  • Turn down the volume on the volume box.
Setting Levels
  1. Talk into the mic and turn up the Trim knob on channel 1.
  2. When the the clip light turns red turn the gain down.
  3. Turn up Aux 1 up ONLY on Mic/Line CH1.
  4. Use the Channel 1 Aux 1 knob and the Aux 1 Master knob to set the levels on the phone hybrid.
  5. Set the Channel 1 and 2 faders to 0 and the main faders to 0.

Phone Call

  1. For campus-wide calls, you may initiate the call yourself. For calls that go outside of the campus, the caller will need to call you.
  2. Press the Speaker* button to have the phone hybrid take the call. (*The topmost button)
  3. Hang up the phone.
  4. Set levels for the phone on channel 2 of the mixer.
  5. To end the call press the End Call* button. (*The bottom button)


  1. Open Audacity.
  2. On the Mixer, the Main Mix faders are "normalled" (no patching necessary) to the MOTU interface inputs 3 & 4.
  3. In Audacity, MOTU inputs 3 & 4 show up as channels 5 & 6 (not confusing at all...), so you will want to set the "Recording Channels" drop-down to "6."
    • The first 6 inputs will be recorded, but you will probably only want the last 2; one is your voice, the other is the caller's voice. You may delete the extra tracks after recording.
  4. KEEP VOLUME KNOB DOWN ALL THE WAY WHILE RECORDING -- this will avoid feedback or bleed into your recording.