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ST-1

DLD Technology

  • • Retro speech synthesizer

Audio examples



ST-1 Speak & Tweak is an emulation of the classic SP0256-AL2 speech chip that was a popular add-on for many home computers in the early 80s.

Speak & Tweak produces sounds using a crude model of the human vocal tract with 6 cascaded digital filters, white noise generator (breath) and tone generator. It contains 59 allophones which when concatenated correctly, can create most English words.

The result is a monotonic, robotic sounding voice that can be tuned precisely to any MIDI note, and is recognisable by anyone who's heard a speech chip from the early days of computing.

Version 1.1 also adds an audio input to allow you experiment with audio sources other than the built in pulse generator.

Mac OS compatible Windows compatible