...By tapping on the C and V keys you can change the Mandelbrot Constant, and this changes the patterns gradually in either direction. There are many keyboard controls you can tap on. The Page Up/Down keys trigger preset patterns.
Random sounds are a combination of sine waves with harmonics, following random numbers, a separate experiment which happened to run in the same program.
The complete source code is also here as one single ASM file, ready for assembly with the 'flat assembler'.