Keyboard controls

• Notes are laid out like a piano starting from Z (C4) and Q (C5)
• CapsLock to enter a note off command
• Use the arrow keys to move the focus around the pattern
• Ctrl+ArrowUp/ArrowDown or PageUp/PageDown to move between patterns
• Space to play/pause
• Enter to step
• Ctrl+Space to go to the start of the song
• Shift+Space to go to the start of the pattern

Source Code