Transport Controls

Choose Tools in the menu bar.
Choose Transport Controls... from the Tools menu.

The Transport Controls are on a floating window and provide a simple, but direct interface for controlling score playback interactively. There are buttons for :

Playing the score from the beginning
Playing the score from the measure the Entry Cursor is in
Pausing and resuming playback.

There are also counters which update the time and the measure and beat of the performance.

To adjust the tempo during playback, you can either move the slider, or click anywhere in the metronome control area.

The red rectangle is the score tempo, the rectangles above create increases in tempo and the rectangles below create decreases in tempo.

You can also use the scroll wheel of your mouse (provided your mouse has a scroll wheel) in order to adjust the tempo during playback.

For maximum control of playback, you can also use the shortcuts in the IIMPE menu for starting stoping or adjusting the playback tempo.