A music editor for TI graphing calculators
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Latest commit 5579081 Mar 20, 2018



A music editor for TI graphing calculators


HoustonTracker 2 is a software sequencer that enables you to create music on Texas Instruments graphing calculators. It uses the machines' communication port to output multi-channel 1-bit music. Its interface is inspired by popular trackers such as LSDJ, Famitracker, and Milkytracker.

HT2 supports several models of the Z80-based line of TI calculators. It is mainly targeted at older, obsolete models like the TI-82, but also works on TI-83, TI-83Plus/SE, and TI-84Plus/SE.

More information and online documentation can be found at http://irrlichtproject.de/houston

Note that the online documentation applies to the stable version of HT2, for the beta version refer to the manual in the /docs folder in source.


  • 3 tone channels
  • 1 non-interrupting drum channel
  • up to 128 note patterns
  • up to 64 drum/fx patterns
  • sequence length up to 255 pattern rows
  • 16-bit frequency precision
  • 8-bit speed precision, can be configured per step
  • various effects, including:
    • L/C/R stereo hard-panning for tone and drum channels
    • 8-bit duty cycle control
    • duty cycle sweep
  • 2 user definable samples
  • up to 8 savestates
  • edit during playback