Using the Master Arpeggiator (Single Preset)

1. Select a preset (preferably one with the prefix 'arp').
2. Set the Arp parameter in the main screen to 'M' for Master Arpeggiator.
3. Press the ARP menu button.
4. Ensure the Status field is set to 'on'.
5. Play the keyboard.

Source: Audity 2000 — audity-2000 (manual)