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Thesys is an extremely powerful and intuitive MIDI step-sequencer plug-in, giving you control over just about all aspects of your favorite MIDI devic...Click To Read More About This Product

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Versatile MIDI controlled step-sequencer.

Thesys is an extremely powerful and intuitive MIDI step-sequencer plug-in, giving you control over just about all aspects of your favorite MIDI devices. Use Thesys to create varied and organic bass lines, screaming leads, pulsating chords, and organic pad sounds in the studio or on stage.

For live musicians, Thesys provides an extremely versatile palette of performance options which can be triggered right from your MIDI keyboard: you can transpose, manipulate, twist up, mutate, and mangle your patterns without even getting near your computer.

Thesys is a plug-in which can be used with any major Windows or Mac VST/AU/RTAS host. This includes Cubase, Logic, Kore, and Ableton Live, among others. No other MIDI sequencer plug-in offers you the ease and power of Thesys. It is 100% MIDI compliant and therefore provides the ultimate MIDI sequencing solution. Thesys is fully 64-bit compatible and includes MIDI Export! Just drag and drop from within Thesys to your host or a generated MIDI file to your desktop.

Sequencer Tracks

The pitch sequencer works in relation to the root key and transposes it by +/- 12 semitones. It can work in chromatic mode or in scaled mode which expands the tonal capabilities a lot. In addition, the pitch sequencer has a flexible recording function.

Lock is part of the pitch sequencer. An active step deactivates the midi transposing. This is useful for keeping important notes and chords in key while transposing the sequence.

The Gate Sequencer creates notes and determines their velocity.

The Mute Sequencer is part of the Gate Sequencer and mutes the selected step.

Gate Time
The Gate Time Sequencer determines how long a note is held. Notes can be held up to four times the duration of a step.

This sequencer moves the pitch the pitch by +/- 2 octaves.

Here you can select from 12 pitch bend figures to be engaged.

A Chord is generated using the current note in the pitch sequencer as the root note. Six Variations and four wrap-arounds for major and minor plus six special chords like diminished and augmented are available.

This sequencer lets you set a multi-trigger at 2, 3, or 4 times the normal sequencer speed, playing the current scale up or downwards or just repeating the current note. 18 breaks are available.

Each sequencer step can be replaced by a random value. Minor and major chords can be individually randomized to maintain the harmonic structure.

Action Section

The Gate Time can be increased or decreased, depending on how long you press the button.

Velo Gate
The note will only play if it is above the selected velocity threshold.

The selected part of the sequence will be looped.

The sequence slows down until it come to a dead stop.

Re-trigger the sequence by re-triggerpressing the button; upon release, the sequencer continues at its normal position..

The sequence will play at half speed.

Octave Up
The sequence will play one octave higher as long as you press the button.

Mutes all data output.

  • Internal synthesizer to create patterns on the fly
  • Special workaround for sending MIDI with the AU plugin
  • Instant keyboard control for Transpose, Pattern Select, Action Section
  • Pattern Sequencer
  • Random and Mutate functions for each sequencer
  • Individual trigger and sync options, swing function

Order today for live or in-studio MIDI control.



  • Compatibility
    VST/AU/RTAS/AAX compatible host software.
    MacOSX 10.4.0 and higher,
    Windows XP and higher,
    1Ghz, 128 Mb Ram
    Plug-in Interfaces
    Mac PPC, Intel: VST / AU / RTAS / AAX

Review Snapshot

by PowerReviews

(based on 3 reviews)

Ratings Distribution

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  • 1 Stars




of respondents would recommend this to a friend.

Reviewed by 3 customers

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(1 of 3 customers found this review helpful)


Terrible documentation ruins it

By Frank Z

from Fairfield, CT

See all my reviews

Ask me a question


  • Quick Composing


  • Documentation Stinks
  • Not Enough Audio Tools
  • Weak Controller Support

Best Uses

    Comments about SUGAR BYTES Thesys:

    Tbere is nowhere I can find in the documentation how to set separate MIDI channels for your controller vs the notes you want your instrument to play. Also there doesn't appear to be a way to change the bottom note of the pattern selector even though I see it change in standalone mode.

    It is unintuitive how this works. While it works as advertised otherwise. MIDI functions need to be made more clear. If you like control over MIDI input and response, be aware that you're flying solo on that aspect.

    Otherwise decent software.

    • Primary use:
    • Personal
    • Computer Platform:
    • PC

    Fantastic Software!

    By Freddy

    from McAllen, TX

    Verified Reviewer


    • Easy To Collaborate Across Programs
    • Easy to Customize
    • Easy to Navigate
    • Versatile


      Best Uses

        Comments about SUGAR BYTES Thesys:

        This plugin, which can also be used as a standalone, is amazing! It's very easy to use and it integretes well with the MIDI FX section in Logic Pro. I don't have anything bad to say about it.

        • Primary use:
        • Personal
        • Computer Platform:
        • Mac

        Great Program, But Crashes PT11 Every Time

        By CWCadwell

        from Chattanooga, TN

        See all my reviews

        Verified Buyer



          • Freezes or Crashes

          Best Uses

            Comments about SUGAR BYTES Thesys:

            This program is really fun and pretty much everything you'd need in a midi sequencer, and more. HOWEVER, this is the second (of two) programs I've bought from Sugar Bytes that crashes Pro Tools 11 every single time I launch it. I've tried reinstalling it several time but to no avail. Standalone works fine, but that means I have to jerry rig it to use it in my songs. no other plugin I've ever used (and I use a LOT of plugins) has so consistently crashed my system.

            I've learned my lesson: no more Sugar Bytes for this PT11 user. M

            • Primary use:
            • Business
            • Computer Platform:
            • PC

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