Used 6 channel sine wave only, 16 amplitude levels and 256 predefined frequencies requiring only 3 to 9 byte per frame without compression.
Tune: Alphaville - Sounds like a melody
4-Bit sample player at 15,625Hz not using the SAA1099
sound chip but only the 1-bit BEEP output using a pulse-width modulation technique.
Data on disk compressed with LzxPack
Lack of memory space means the sample is stored as 3-bit 7812.5Hz and recalculated to 4-bit 15625Hz for playing.
Sample: The Toy Dolls - One more Megabyte
Presented at Forever 2017