J74 HarmoTools is a collection of Max for Live devices designed for real-time MIDI harmonization within Ableton Live. These tools enable users to detect chords and scales from MIDI clips or live MIDI input, providing dynamic adaptation of MIDI tracks that follow the detected harmonic context instantly. This enhances creative workflow by allowing seamless harmonic adjustments without interrupting the performance or production process.

The set includes specialized devices such as chord and scale detection plugins, along with a MIDI harmonizer that filters notes based on the identified chords or scales. Additionally, it offers a chord rack for scale-based composition and visualization tools tailored for guitar chords and scales. These features expand harmonic possibilities and make it easier to explore musical ideas within a structured framework.

For collaborative projects, J74 HarmoTools provides networking tools that facilitate real-time interaction between musicians over a TCP/IP connection. This capability supports synchronized harmonic work across different setups, enhancing group creativity. As a free resource, it offers producers and performers a powerful harmonic toolkit to enrich their MIDI compositions and live performances.