Still Got the Blues

Super Game Boy / Noise channel mixer.

Controls

• A activates SGB sound A/B
  • A while holding START clears SGB sound
  • A while holding SELECT+START resets SGB sound
• B activates CH4 noise
  • B while holding START clears CH4 noise
  • B while holding SELECT+START resets CH4 noise
• START triggers all three in unison
• D-pad adjusts/moves between params
  • Adjust while holding A/B/START provides constant feedback
• SELECT moves between param groups
  • A while holding toggles SGB sound A/B
  • Up/Down while holding moves to respective param group
• A+B displays the parameter string

Parameter String Mapping

Register	Alt	Bits	Digit	Bits
SOUND01		4 - 5	0	0 - 1
SOUND01		0 - 3	1
SOUND02		4	0	2
SOUND02		0 - 3	2
SOUND03		0 - 3	3
SOUND03		4 - 7	4
AUD4LEN	NR41	4	0	3
AUD4LEN	NR41	0 - 3	5
AUD4ENV	NR42	4 - 7	6
AUD4ENV	NR42	0 - 3	7
AUD4POLY	NR43	4 - 7	8
AUD4POLY	NR43	0 - 3	9
AUD4GO	NR44	6	Border

Building from Source

make

Known to work with RGBDS 0.9.2 on MSYS64.

Limitations

Due to the tight schedule of GB Compo 2025, the following features have been left for a future release:

• Top part enable/disable animations
• Top part digit animations
• Bugfixes

Accessibility

The tool has been designed with accessibility in mind. High-contrast assets are utilised for the benefit of the visually-impaired user.

Thanks

• Nikku4211 for inspiring the creation of this tool and for initial testing
• m2m for testing on actual SGB and SGB2 hardware
• Rangi42 for patiently answering every dumb question
• Marc Robledo for creating some great GB development tools
• The entire GBdev community for their awesomeness
• avivace and bbbbbr for organising GB Compo 2025
• itch.io for hosting the event
• the judges for their hard work