Refentra
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Plan and hear chord progressions

Major/natural-minor degrees1–7, triads, key/octave, BPM and beats; editable roster≤16chords, ≤60s.

  • Runs in your browser
  • No upload
  • Check before download

Audio stays on this device. No upload or microphone recording. Major/natural-minor degrees1–7, triads, key/octave, BPM and beats; editable roster≤16chords, ≤60s. Rule-based symbols, sine audio and native MIDI; no creative-quality promise. Generation stays local, with a 20-second deadline, up to 60 seconds and 24 MiB of PCM, and a 12 MiB 16-bit WAV. Nothing plays before you act. There is no source file to modify.

Supported model and limits
Degree

How to use this tool

  1. Key

    Audio stays on this device. No upload or microphone recording. Generation stays local, with a 20-second deadline, up to 60 seconds and 24 MiB of PCM, and a 12 MiB 16-bit WAV. Nothing plays before you act. There is no source file to modify.

  2. Supported model and limits

    Major/natural-minor degrees1–7, triads, key/octave, BPM and beats; editable roster≤16chords, ≤60s. Rule-based symbols, sine audio and native MIDI; no creative-quality promise.

  3. Download

    Download · Major/natural-minor degrees1–7, triads, key/octave, BPM and beats; editable roster≤16chords, ≤60s. Rule-based symbols, sine audio and native MIDI; no creative-quality promise.

Supported model and limits

Amplitude (peak)

Generation stays local, with a 20-second deadline, up to 60 seconds and 24 MiB of PCM, and a 12 MiB 16-bit WAV. Nothing plays before you act. There is no source file to modify.

Supported model and limits

Major/natural-minor degrees1–7, triads, key/octave, BPM and beats; editable roster≤16chords, ≤60s. Rule-based symbols, sine audio and native MIDI; no creative-quality promise.

How can I check this result?

Compare the chord order, key, mode and beat lengths with the list. Reopen the MIDI in a sequencer. The WAV contains the sine-wave rendering described in the tool, not a sampled instrument.

Some audio workflows use Mediabunny1.60.0 (MPL-2.0). Copyright notices and original license · Download preferred TypeScript source1.60.0