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S1Utility, image 1 from its README
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Firmware

S1Utility

Rising78/100

A desktop editor and patch inspector for Roland AIRA Compact S-1 Tweak Synthesizer

S1Utility is custom firmware for the Roland S-1, by @denzlobin. Open source under GPL-3.0, latest release v1.2.0 (October 2026), 25 stars on GitHub.

forRoland S-1·by@denzlobin

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25
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4
Commits
139
Last commit
Download v1.2.0

S1Utility-1.2.0-win-x64.zip· 73 MB· +3 files

GPL-3.0· denzlobin/S1Utility·downloads come from the creator’s GitHub releases

139
Commits
8
Releases
139 commits and 8 releases in the last year
Activity · last 12 months
8 releases
  1. v1.2.0Latest4 files

    Fixes

    PRM format mismatches reported and hardware-verified by @russellyvr (#3, #4), and re-checked on an S-1 running firmware 1.02:

    • Pitch bend: recorded bends are stored as -8192..8191. MIDI export and the PB lane were treating them as ±32768, so bends came out at a quarter of their size.
    • Portamento: On and Auto were swapped in the editor.
    • Delay and reverb high cut: the list was off by one step (2k showed as 1.6k, 630 showed as Flat).
    • Motion data: all 512 motion rows are now read (8 samples per step). Previously most of a pattern's recorded motion was dropped.

    Step view

    • Sub-steps are drawn as split notes, and a probability lane appears when any step is below P.100.
    • Motion and pitch-bend lanes are drawn as smooth curves.
    • The view scales with the window; drag the corner to enlarge it.
    • Hover any step, in the note roll or an automation lane, for exact values.

    Linux

    • The AppImage now embeds update information, and the .zsync file is published, so AppImageUpdate can fetch new releases.

    Thanks to @russellyvr for the detailed reports and hardware captures.

    Full Changelog: https://github.com/denzlobin/S1Utility/compare/v1.1.1...v1.2.0

  2. v1.1.13 files

    Full Changelog: https://github.com/denzlobin/S1Utility/compare/v1.1.0...v1.1.1

  3. v1.1.03 files

    Full Changelog: https://github.com/denzlobin/S1Utility/compare/v1.0.1...v1.1.0

  4. v1.0.11 file

    Full Changelog: https://github.com/denzlobin/S1Utility/compare/v1.0.0...v1.0.1

  5. v1.0.01 file

    Full Changelog: https://github.com/denzlobin/S1Utility/compare/v1.0.0-rc3...v1.0.0

  6. v1.0.0-rc31 file

    Full Changelog: https://github.com/denzlobin/S1Utility/compare/v1.0.0-rc2...v1.0.0-rc3

  7. v1.0.0-rc21 file

    Full Changelog: https://github.com/denzlobin/S1Utility/compare/v1.0.0-rc1...v1.0.0-rc2

  8. v1.0.0-rc11 file

    Full Changelog: https://github.com/denzlobin/S1Utility/commits/v1.0.0-rc1