The Event Bar is where most of the work of creating and playing patterns in Boom is done.
In Pattern Edit mode, the sixteen numbered Event switches that make up the Event Bar each correspond with a 16th note step in the current pattern. The rhythm of the currently selected instrument is shown. By default, in an empty pattern, all of the Event switches will be dark, indicating that the selected instrument will not play on any of the 16 steps.
When an Event switch is selected, it lights to show that the selected instrument will play at that step in the pattern.
Clicking (or triggering via MIDI or a control surface) a step’s switch a 2nd or 3rd time will cycle it through two levels of lowered velocity, reducing that step’s volume. Clicking the switch again will silence that step, and turn off its light.
Right-clicking an Event switch will toggle its on-off state, preserving the current velocity setting.
In Pattern Select mode, the Event switches choose between the 16 patterns in the current preset.