A Free Solution For DAW Global Microtuning

The MTS-ESP Mini plug-in loads .scl, .kbm or .tun files and retunes all connected MTS-ESP client plugins. It can also load and receive MIDI Tuning Standard (MTS) SysEx messages. Instead of updating dozens of virtual instruments the tuning can be changed from a central location, reducing the time it takes to get everything in tune and leaving more time for you to create. Best of all, it’s completely free!


  • Import .scl, .kbm and .tun tuning and mapping files
  • Support for multi-channel mapping using Anamark TUN .msf or multi-channel .kbm formats
  • Support for all MTS SysEx formats, either loading from file or sending in via DAW
  • Automatically update tuning of MTS-ESP aware plugins
  • Includes basic sine/saw synth for auditioning tuning and acting as a pitch reference
  • Stores and recalls tuning in a DAW session
  • Bypass button to return to 12 TET instantly
  • Tiny CPU use
  • Simple, ergonomic interface
  • Mac Retina and Windows HiDPI support
  • FREE!

Windows System Requirements

  • Vista / Windows 7 / Windows 8 / Windows 10 / Windows 11
  • 32 bit or 64 bit
  • A host that supports VST, VST3 or AAX plug-ins.

Mac OS System Requirements

  • macOS 10.9 or newer
  • 64 bit only
  • A host that supports VST, VST3, AU or AAX plug-ins.
  • Intel or ARM Mac

1.11 (2023-10-29)

  • AAX support for Apple Silicon.

1.10 (2022-11-16)

  • Fix VST3 bundle structure for architecture on Windows.

1.09 (2022-10-31)

  • Fix crash when moving between insert slots in Logic.
  • Fix UI positioning in Reaper when window size is smaller than plug-in UI size.
  • Migrate to VST3 bundle structure and ensure VST3 version can replace VST2 if no longer supported by the host.

1.08 (2021-12-15)

  • Multi-channel fixes.
  • Add option disable receiving of MTS SysEx messages.
  • Fix installer for 32 bit Windows.

1.07 (2021-11-09)

  • Add support for receiving and loading MIDI Tuning Standard (MTS) SysEx.
  • Add internal synth.
  • Add support for multi-channel .kbm files.
  • Add support for TUN multiple scale files.
  • Improved support for TUN [Mapping] section.

1.06 (2021-08-18)

  • Fix broken mapping with .scl import.
  • Reset MTS library to 12-TET on instantiating.

1.05 (2021-08-05)

  • Support linear .kbm files when loading .scl and .kbm together.

1.04 (2021-06-22)

  • Fix MTS-ESP tuning updating if session loaded with bypass automated on.

1.03 (2021-05-07)

  • IPC support for MTS-ESP.

1.02 (2021-04-11)

  • Relocate MTS-ESP library to Common Files folder on Windows.

1.01 (2021-04-02)

  • Fix connection info disappearing.

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