The panel on the right side of the Ozone interface is the main input/output section for Ozone. This is used for setting and monitoring gain levels going into and coming out of Ozone.

Setting Input and Output Gain
You can adjust the input or output gain by sliding the faders with the mouse, either by clicking and dragging or clicking and using the wheel of a wheel mouse. You can also use keyboard shortcuts to adjust the level in small increments.
Adjusting Left and Right Channels Independently
By default, the left and right gains are linked so moving one moves the other. You can adjust left and right gain independently by clicking on the "lock" icon. You can offset the two channels and then "relock" them, so that later adjustments move both channels by the same amount.
Faders will remember their offset even if they are temporarily turned up or down all the way, so that when you bring the faders back to the middle the offset will be preserved.
Double-click to Reset Faders
If the left and right faders are locked, double clicking on either fader will reset both of them to 0 dB. If the left and right faders are unlocked and set at different levels, double clicking a specific fader will reset it to 0 dB. If the left and right faders are locked but had been previously been set to different levels, double clicking on a fader will reset it to match the level of the other fader. Another double click will reset both faders to 0 dB.
Setting the Scale of the Meters
You can further customize your metering by adjusting the scale of the input and output meters. Clicking the (+) sign below the meters will increase the zoom or resolution of the metering scale, and clicking the (-) sign will decrease or zoom out the resolution of the metering scale.
Setting the Source of the Meters
The small orange and blue button below the meter allows you to choose the source of the input/output meters. When engaged the meters will display the Mid/Side levels and when off (default) the meters will display Stereo (left/right) levels.
More Information
Right-clicking (under OS X you can also ctrl-click) on the level meters provides an options screen for the level meters.
You can set a gain offset for when Ozone is bypassed, to compare the sound when Ozone is on and off with a relative increase in volume to help you objectively preview Ozone's processing with matched gain when Ozone is bypassed.