David Thiel made the music for games like Winter Games, Championship Wrestling and Rock n' Bolt. He worked with the ColecoVision, Adam, Atari 400/800 and the C64. He developed a sound system (DDTSS) for the C64 that it supported six channels. This system combined the 3 voices and 3 virtual channels for sound effects. You can read the complete interview on the C64.com web page.