Smarter voice leading
Chords are re-voiced so notes move smoothly between changes instead of jumping around awkwardly.
Chord Enhancement
AI Chord Progression Improver
Upload an existing MIDI chord progression and KeyTone rebuilds it with smarter voice leading, richer voicings, and intent-driven variations, from subtle polish to a bold reharmonization.
What it does
Safe, Pro, and Bold intents
Choose how far to push the reharmonization, from a light touch-up to an intentionally unexpected take.
Works from any MIDI sketch
Start from a rough MIDI chord sketch, even a simple block-chord draft, and KeyTone builds it out.
Key-aware transposition
Change the key of a progression with real chromatic transposition, not naive note-shifting.
Target any instrument lane
Improve melody, bass, or full-chord lanes independently depending on what you're working on.
Fast turnaround
Get results back in well under a minute so you can stay in a creative flow instead of waiting around.
Frequently asked
Do I need to know music theory to use this?
No, you pick an intent (Safe, Pro, or Bold) and KeyTone handles the harmonic decisions for you.
Can it fix a progression that sounds "off"?
Yes, that's exactly what it's built for: cleaning up voice leading and chord choices that don't quite sit right.
What file types can I upload?
MIDI files (.mid or .midi) up to 25MB. Need MIDI from an audio recording first? Use Audio to MIDI, then bring the result here.
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Try it free, no credit card required
Every free account gets weekly credits across all Create tools, and Discover tools are always free to use.