Audio Interface - Mixing Bench

This lab has a MOTU 828mk3 audio Interface which has multiple inputs and outputs.  Unfortunately, the order and labeling of the inputs and outputs in the audio applications can be confusing.

Inputs

• There are two XLR/1/4" mic/instrument inputs on the front.
  • Microphones can be connected to theses inputs with XLR cables.
  • Guitars can be connected with 1/4" cables.
  • Each input has:
    • Trim control knob for setting levels
    • Pad for reducing inout levels
• There are eight 1/4" line level inputs on the back.  
  • Inputs 1 and 2 are connected to the patchbay.
  • The main outputs of the mixer are connected directly to inputs 3 and 4.  
  • The other inputs are not being used.
  • Do not connect or disconnect cables on the back.

Outputs

• There are two XLR Main outputs on the back.
  • Theses are connected directly to the Mackie Big Knob volume box input A.
• There are eight 1/4" line level outputs on the back.
  • Outputs 1 and 2 are connected to the patchbay.  
  • The other outputs are not being used.
  • Do not connect or disconnect cables on the back.

Labeling

• The various audio applications may refer to the inputs and outputs with slightly different names.
• We have tried to set the preferences to meaningful names but sometimes they may revert back to the default names.  

Inputs

• Mic/Instrument inputs come before the line inputs.
• This makes the numbering of the analog inputs confusing.
  • For example analog input 1 is input 3.

MOTU Inputs	Software Label
Mic/Instrument 1	Input 1
Mic/Instrument 2	Input 2
Line 1	Input 3
Line 2	Input 4
Line 3	Input 5
Line 4	Input 6

Outputs

• The Main outputs inputs come before the line outputs.
• This makes the numbering of the analog outputs confusing. 
  • For example analog output 1 is output 3.

MOTU Outputs	Software Label
Main Out 1	Output 1
Main Out 2	Output 2
Line 1	Output 3
Line 2	Output 4