Hey by the way how did you get the sound fx to sound so clean? I tried and the wav files have this weird buzz noise after the wav plays. Oh and one more thing after viewing the vhs tape in the nowhere section of the game it started making a static sound that wouldn't stop
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First, I download the mp3 audio files, then use some audio editting apps like Audacity, resample the SFX to 8000 Hz, filter in 100 - 5834 Hz range, crank the volume up to 8 - 9 dB, and finally export the sound as unsigned 8-bit wav file. That's how you convert SFX to 8-bit.
Notice: GB Studio's built-in emulator still make buzz sound so you have to export the game as ROM and play on another emulator.