Tempo Settings. This item on the Options menu brings up a requester which sets the tempo and time signature for the metronome and the Timeline grid. The metronome can be set to play only when recording, or when playing back as well. It uses two sounds, which are stored on disk as AIFF files called MetronomeHigh and MetronomeLow. One is used for the first beat of each bar and the other for the remainder. You can set any time signature by typing in the two small boxes.

The tempo can be set with the slider, either by sliding or by clicking either side of the bar. It can also be set by measuring the beats in a sample. This is fairly easy for a percussion sample. Before opening the Tempo requester, click on the Ranges button at the top of the Timeline. Inspect your sample at a high magnification. Click the left mouse button at the beginning of a bar, and alt-click at the end of the bar to mark the range. Then you can open the requester and click "Get tempo from range".

"Get tempo" expects you to have marked a period of 4 beats. If you marked some other number of beats, change the number marked "Range equals" before clicking the "Get tempo" button.

Synchronisation. Audio Evolution can be made to play or record in synchronisation with another music program, on the same or another computer. This is controlled from the Sync menu.