Open Babya Logic Pro by double-clicking on its icon on the desktop. You'll see a grid divided horizontally by four-beat measures and vertically by notes of the musical scale.
Select a track to edit by clicking its number at the top of the screen. Select an instrument by dropping down the Instruments menu and clicking on an instrument name.
Compose a note by clicking in one of the measures, in the row of a note you'd like to play. For instance, if you want your first note to be middle C, click on the row marked "C4." You'll hear the instrument you selected play a quarter note (one beat). To substitute a different note, click the same place in the measure, but at a higher or lower row.
Make a two-beat half note by clicking in a measure and dragging the color bar across two boxes in the row. Dragging across all four boxes in a measure produces a whole note. You can create more sustained notes by dragging the color bar across several measures.
Delete any note by right-clicking on it.
Play your composition at any point by clicking on the green arrow button at the top left of the screen.
Add simultaneous notes by selecting a different track number. The notes you draw for that track will be color coded for that track. You can add notes from the same instrument or different instruments.
Add percussion by selecting a percussion instrument and painting notes anywhere on the grid.