Lol, I feel that! On my 2600 game Ooze! I would drop item Y values into the audio registers as a poor man's way of making some cool sounds of enemy advancing.

Lol, I feel that! On my 2600 game Ooze! I would drop item Y values into the audio registers as a poor man's way of making some cool sounds of enemy advancing. Same for the player missile. As it travels, some variation of its Y value becomes the sound. Tossing bytes at ports does insure the user associates the noise with the right on screen action. Anyhow, great art! You did a fine job making things stand out and that is not easy.