ST-1 Speak & Tweak




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.

  • Speed and pitch controls
  • Lock tempo control (allows multiple voices to play at same speed, different pitch)
  • Bucket Brigade Device (BBD) Delay
  • Polyphonic use
  • Damage control to artificially detune the filters
  • Pitch bend and after-touch support
  • Low DSP usage
  • Plenty of CV inputs



Download the ST-1 Manual

Watch the tutorial video:

Listen to it in action:


Revision History:

V1.00 Initial Version
V1.01 Improved audio quality when lock tempo is enabled