Apple Logic Pro 9 - Manual (Page 265)

To set the channel strip input format for the selected audio track
µ
Click-hold the button directly below the channel strip’s level meter, and choose the input
format from the menu that appears.
Tip: On a stereo or mono channel strip, you can simply click the button to switch between
mono or stereo.
Setting Channel Strip Volume Level and Pan/Balance Position
You can set a channel strip’s volume level and pan/balance position.
To set the volume level of a channel strip
µ
Drag the channel strip’s Volume fader up or down.
Volume fader
The maximum boost is +6 dB. You can reset the Volume fader to 0 dB (90) by
Option-clicking it.
265 Chapter 10 Working with Instruments and Effects