Orra Audio has released Orra Key ↗ (opens in a new tab), a free key-detection plugin for macOS and Windows. The utility is designed to identify the key of samples and loops, present chord options for that key, and export chord ideas as MIDI through drag and drop.
For beatmakers working quickly through sample folders, the appeal is straightforward: establish a loop's likely tonal centre, audition a harmonic starting point, then place MIDI chords into a project rather than programming every note from scratch. The release was first reported by Bedroom Producers Blog ↗ (opens in a new tab).
Key Takeaways
- Orra Key is a free plugin for macOS and Windows.
- It is intended to detect the key of sampled audio and loops.
- Producers can preview chords related to the detected key.
- Chord ideas can be dragged from the plugin into a DAW as MIDI.
- The supplied information does not establish supported plugin formats, DAW compatibility or key-detection accuracy.
What Orra Key is designed to do
Key detection is most useful when a sample has no reliable metadata, has been transposed, or needs to sit beside newly programmed bass, pads or vocal chops. Rather than treating a sample's filename as definitive, Orra Key analyses the audio and returns a key result intended to guide the rest of the arrangement.
From there, the plugin offers chord previews, allowing users to hear harmony associated with that detected key before committing it to the session. This can be useful for turning a short melodic loop into a workable progression, or for finding supporting material around a sampled hook without repeatedly trialling notes on a keyboard.
Its defining workflow feature is MIDI chord export. Instead of using the displayed chords only as theory reference, producers can drag the selected material into a DAW and edit the resulting MIDI clip. That leaves room to change inversions, voicings, rhythm, velocity and octave placement to suit the track. Producers unfamiliar with the basics of note and key relationships may also find Product London's guide to using a music calculator for notes, intervals and keys useful alongside the plugin.
Where it could fit in a sample-based workflow
A practical use case is starting with a loop that supplies the track's main musical identity, then using its detected key as the basis for an initial chord bed and bassline. Exported MIDI can provide a quick sketch rather than a finished harmony part: check the notes against the audio, remove clashes, and reshape the chord rhythm around the groove.
Electronic producers may also use the tool when combining loops from different packs. If two musical samples appear compatible but feel unsettled together, confirming their tonal centres is a sensible first check before reaching for processing. Transposition may be necessary, and key detection should be treated as a useful analysis result rather than a substitute for listening.
The MIDI export also means Orra Key's output is not locked to a particular writing method once it reaches the DAW. In Ableton Live, for example, a producer can refine the dragged chord clip in the piano roll using the techniques covered in our guide to MIDI editing in Ableton's Piano Roll. The same principle applies in other MIDI-capable hosts: the exported chords are a starting point that can be rearranged into a more individual progression.
Check the result before building the track around it
Key-detection tools can be particularly helpful with clearly pitched material, but sparse percussion, heavily processed audio, ambiguous harmony and recordings that move between tonal centres can require manual judgement. A loop may also imply a scale or mode more clearly than a simple major/minor label suggests.
Before committing to a bassline or layering several harmonic parts, audition the proposed chords against the original sample and listen for notes that fight its strongest pitches. A piano keyboard reference or a second analysis method can help when the result is uncertain; Product London's guide to analysing digital tracks with key-finder tools covers that wider process.
Orra Audio also provides an Orra Key user manual ↗ (opens in a new tab) for users who want to explore its workflow. At publication, the available information confirms the free macOS and Windows release and its core detection, chord-preview and MIDI-export functions, but does not specify plugin formats, minimum system requirements, compatible DAWs or performance benchmarks. Those details are worth checking before making it part of a regular session template.