Apple MainStage 2 - Manual (Page 138)

You can also use MainStage with vocals, or any sound captured with a microphone, using
an audio interface connected to your computer and choosing the audio input channel
in audio channel strips in your patches.
For guitar patches that use multiple channel strips, you can control the overall volume
of the patch using a foot pedal. Using the following procedure, you can set the overall
volume for the patch (that is, for all channel strips) so it starts playing at the set volume
level but still control subsequent volume changes using the foot pedal.
Using the Tuner
MainStage includes a Tuner that you can use to tune guitars and other instruments you
play through an audio channel strip. The Tuner shows pitch on a circular scale with the
note name and octave displayed in the center of the scale. When you play a single note
on your instrument, the pitch is shown in relation to the correct pitch for the note
displayed.
You can use the Tuner on an instrument connected to the first audio channel strip in a
patch. Channel strips that can use the Tuner are indicated by a tuning fork icon near the
top of the channel strip.
To tune an instrument using the Tuner
1 Select the audio channel strip you want to use the Tuner with.
2 Click the Tuner icon in the toolbar (or press Command-T).
The Tuner appears in the workspace.
138 Chapter 9 Performing Live with MainStage