I use a casio keyboard and a 1989 "gray brick" gameboy using the sound check device on an old game called "lil monster" that's an obvious spinoff of pokemon but the sound samples are exquisite and much subject to distortion :3 I found out you can use the actual sound samples in the check device to distort or block out another channel in the actual music loop :3 (since ya know that these old gameboy bricks had 8-bit sound quality and only 4 sound channels, 2 square wave channels, a noise channel, and a triangle wave channel)