GoKawiilDeveloper explores multichannel 1-bit sound tricks on the ZX Spectrum
A hobbyist developer documented an experiment attempting to bring advanced PC-speaker-style audio techniques, including PCM and PWM sample playback, to the ZX Spectrum's single-bit beeper. The main breakthrough was getting rudimentary multichannel sound, essentially chords, to play through the one-bit speaker, though the original goal of full PC-style playback fell short.