Applies to: Scarlett 2nd/3rd Generation 6i6, 18i8, 18i20 + Clarett
Many users want to use their interface for Live streaming or video call programs like Skype, Teams, Zoom, Messenger or other VOIP (Voice Over IP) programs.
Most VOIP programs are only able to send a single Mono Stream to the Internet, so they are restricted to the first input on any audio device.
Usually, with a built-in microphone on your computer you never notice this because even though it records in two-channel the two microphones are so close to each other their signals are identical.
Some select programs may be able to address the first two Inputs and send in Stereo to the Internet, so if this is the case you can alter these settings to create a Stereo Mix rather than a Mono Mix (if your contact at the other end of the stream is only hearing you on their left side/headphone your software will be sending a stereo stream).
You can use the Mix feature on our interfaces, using Focusrite Control, to create a "Mix-Minus". This will create a mix of your Inputs into one Mono Signal which you can be sent from an output and back into Input 1 (or input 1/2 in the case of stereo) so that your video call application can receive the whole mix of inputs.
To do this start by going to File > Restore Factory Defaults, your screen should look like the screenshot below:
- In Focusrite Control, under Output Routing, choose an output to use in Mono, such as Line output 3.
- For Line Output 3 set this to a custom mix in order to choose what we'd like to send to this output (Note: Custom Mixes are disabled at 176.4 & 192kHz.
In-Line output 3 make sure Hardware Input 1 is Muted and Turned down. This will avoid a nasty feedback loop. Also, Mute and Turn Down Software Playback 1-2 from this mix so the person you're contacting can't hear themselves.
Use Inputs 2 and onward for the XLR Mic Inputs or 1/4" Line Inputs or Instrument Inputs. You can add this into your custom mix on the right and label these accordingly.
Plug a 1.4" TRS Jack to Jack cable from the Line Output you are using at the back and into Input 1 on the front. In this example, we are using Output 3, if in stereo you could use 3+4 and go into input 1+2
Raise the Gain Knob to the proper level where there is a strong signal (constant green when sound is made), with no clipping (flashing red).
Then set your VOIP software to the interface, this is usually in the preferences, audio settings or microphone settings.
You can now use the Custom Mix of Line Output 3 to mix the inputs live on the call. If one person or instrument is much louder than another naturally this can be useful to turn them down.
For a guide on how to do this with interfaces that use Mix Control, Scarlett 1st Gen and Saffire's, please see this article: