Brickwall Composer

Click and Drag the mouse the create sound platforms.

Drag the platform itself to change its position. Drag the circle handles of the platform to change the shapes.

[Tab] to switch next platform's instrument.

[U] to undo

[C] to clear

[Esc] to see the Save/Load options (saving doesn't work for WebGL version)

[Right Click] the platform to switch its states: 

1. Normal
2. Disabled
3. Alternatively passable
4. Bouncy
5. Absorptive

Scrolling [Mouse Wheel] on the platform to switch the platform's instrument.

Tips: The top-left corner is suitable for bass & drums. Other sessions are good for melodies.

Example:

Legacy Example 1:

Legacy Example 2: