Getting started
Everything you need to know before your first conversion.
No. The conversion pipeline is fully automatic. You upload a file, select source and target keyboard models, and the engine does the rest. The review UI shows you the suggestions in plain language — you can approve everything with one click, or override individual mappings if something doesn't sound right.
A mapping is flagged when a source percussion note doesn't have a clear equivalent on the target keyboard. This commonly happens with proprietary ethnic percussion sounds, or with sounds that appear only occasionally in a style. These mappings are highlighted so you can review and override them before downloading.
The musical content is preserved — the same sections, the same rhythm patterns, the same groove. What changes is the timbre: you're now hearing the target keyboard's voices, not the source. Think of it like the same song played on a different instrument. It's yours, it plays correctly, it just sounds like it lives on the new keyboard — because it does.
Both the original uploaded file and the generated output file are automatically deleted 24 hours after the conversion job completes. See our
privacy policy for full details on data retention.
An arranger keyboard style file is a MIDI-based file that contains the auto-accompaniment data for a particular musical genre or rhythm. It includes multiple sections (intros, mains, fills, endings) each with separate MIDI tracks for drums, bass, chords, and melody. Yamaha uses .sty/.sst/.pst files, Korg Pa-series styles are exported as .mid (SMF) or native .stg/.kst containers, and Ketron uses .kst/.pat files.
Yamaha: Genos2, Genos, PSR-SX900, PSR-SX700, Tyros5 (SFF2 and SFF1 style formats — .sty, .sst, .pst).
Korg: Pa5X, Pa4X, Pa700, Pa300 (SMF .mid export, or native .stg / .kst containers).
Ketron: Event, SD9, Midjay (.kst and .pat style files).
We currently support all six conversion directions: Yamaha → Korg, Yamaha → Ketron, Korg → Yamaha, Korg → Ketron, Ketron → Yamaha, and Ketron → Korg.
Most conversions complete within 15–45 seconds depending on the complexity of the style and the number of sections. Priority processing (Pro and Studio plans) places your job at the front of the queue, typically reducing wait times to under 10 seconds.
Drum mapping
How the drum detection and remapping engine works.
DROP means that MIDI note will be silenced in the converted file — its events are removed entirely. This is the appropriate choice when a source sound has no reasonable equivalent on the target keyboard and any replacement would sound worse than silence.
Yes, on any paid plan (Starter, Pro, or Studio). After confirming a conversion you are offered the option to save the drum mappings as a named drum map. On future conversions you can select this saved map from the dropdown and it will be applied automatically.
Yes, with caveats. The engine's three-pass approach identifies ethnic percussion channels correctly in most cases. Mapping quality depends on how closely the target keyboard's drum kit matches the source. For highly specialised sounds, some manual overrides in the review UI will usually be needed.
Root key detection
How chord root keys are detected and corrected.
Arranger keyboards use NTT (Note Transposition Tables) to respond to chord input and play chord voices in the correct key. If the root key is wrong, the chord voices play out of tune when you press keys on the keyboard. Correct root key detection ensures the converted style responds to your playing just like the original did.
Yes. In the Review UI, the root key detections table shows every section and channel with its detected key. Click the override dropdown on any row to select the correct key. Your override is applied when you click "Confirm and generate file."
Some styles use chromatic chord voicings that don't imply a single root key. In these cases the analyser may detect different keys across sections. This is normal — you can review and override any detection, and the converted file will behave the same way.
Billing & plans
Subscriptions, credits, and payment questions.
One conversion is one uploaded style file processed through the full pipeline. The number of sections or tracks inside the file does not affect the count — it's per file. A conversion is counted when you click "Start conversion", regardless of whether you subsequently download the result.
No. Monthly conversions from your subscription plan reset on your billing renewal date. However, credit pack conversions never expire and are separate from your monthly allowance.
Yes. Cancel from your billing settings at any time. You keep full access until the end of your current billing period. No partial-month refunds are issued, and you will not be charged again after cancellation. Your account reverts to Free tier at the end of the period.
No. Once purchased, credit packs are non-refundable as per our terms of service. Unused credits in a pack never expire.
When you upgrade to a higher plan during an active billing period, you receive a prorated credit for the unused portion of your current subscription. This credit is automatically applied to the cost of the new plan, so you only pay the difference. The change takes effect immediately and your new monthly allowance starts right away.
Not yet. Team plans with shared conversion pools and centralised billing are on the roadmap. If you need a volume arrangement now, contact us at
[email protected] to discuss options.
Formats & compatibility
File format questions and known limitations.
No. rearranger.ai specifically processes arranger keyboard style files, which have a proprietary structure beyond standard MIDI. A regular MIDI file (.mid) cannot be converted because it lacks the section markers, CASM data, NTT tables, and other metadata that the conversion pipeline requires.
Conversion details
What the converter preserves, what it changes, and why.
Mega Voices and Super Articulation voices are proprietary Yamaha technology — they use hidden velocity zones and special note ranges to trigger effects like guitar slides, hammer-ons, and bass slaps. Since these velocity zones have no equivalent on Korg or Ketron keyboards, the converter detects Mega Voice channels and maps them to the closest standard GM instrument (e.g., Acoustic Guitar Nylon, Electric Bass Finger). The musical notes and rhythm are fully preserved; only the articulation triggers are simplified.
Guitar Mode is a Korg-specific feature that uses a dedicated channel type to simulate realistic guitar strumming patterns. This feature relies on the Korg arranger engine and has no direct equivalent on Yamaha or Ketron keyboards. When converting a Korg style that uses Guitar Mode, the guitar channel is treated as a standard melodic accompaniment channel. The note data and rhythm are preserved, but the strumming articulation behaviour is not replicated.
No. Effects like reverb depth, chorus level, and DSP routing are brand-specific — a Yamaha reverb algorithm is fundamentally different from a Korg or Ketron reverb. The converter preserves the musical MIDI data (notes, timing, dynamics, program changes) but does not attempt to transfer effect settings. After loading the converted style on your target keyboard, you may want to adjust the effects to taste using your keyboard's built-in mixer.
The converter uses voice mapping tables to find the closest matching sound on the target keyboard. It reads the Bank Select and Program Change messages from the source file and maps them to equivalent instruments using a hierarchical lookup: exact match first, then bank family, then General MIDI fallback. Most standard instruments (piano, strings, bass, brass) map cleanly. Unusual or proprietary sounds may fall back to the nearest GM equivalent.
The converter maps sections between brands using a canonical system: Intros, Main Variations (A–D), Fills, Breaks, and Endings. Some brands have more section slots than others. For example, Yamaha styles may have up to 4 Main variations and 3 Intros/Endings, which map directly to the equivalent Korg or Ketron slots. If the source style has fewer sections than the target supports, only the available sections are included — no empty sections are generated.
These are not included in the conversion. rearranger.ai converts the style accompaniment data only — the MIDI-based rhythm, bass, chord, and pad tracks that make up the auto-accompaniment pattern. Features like Yamaha OTS, Korg STS, Multi-Pads, and Registration Memories are keyboard-specific presets stored separately from the style data and are not portable between brands.
The maximum upload size is 20 MB per file. Most arranger keyboard style files are well under 1 MB, so this limit is rarely an issue. If your file exceeds this limit, check that you are uploading a style file and not a song or recording.
Using the converter
Tips for getting the best results from your conversions.
On your Korg PA-series keyboard, go to Style → Save/Export → SMF and save the style as a Standard MIDI File (.mid) to a USB stick. Upload this .mid file to rearranger.ai. The converter auto-detects that it came from a Korg keyboard — you only need to select your target keyboard.
Source detection is automatic and based on file markers embedded in the style. In rare cases, a heavily edited or third-party style may be misidentified. If you notice the wrong source keyboard in the Review step, cancel the conversion and contact support at
[email protected] with the file attached — we can investigate.
Yes. Go to My Conversions to see all your past conversion jobs. Click the download button on any completed conversion to re-download the output file. Note that files are automatically deleted 24 hours after conversion — after that, you would need to re-upload and convert again.
Batch upload is available on the Studio plan. You can upload multiple style files at once (or a single ZIP archive). Each file becomes a separate conversion job using the same target keyboard. Credits are deducted per file. You can monitor all jobs from My Conversions and download them individually or as a single ZIP file.
Yes, as long as the file is a genuine arranger keyboard style in one of the supported formats. Third-party styles and styles shared between users generally convert just like factory presets. However, some third-party styles use non-standard MIDI structures or channel assignments that may produce unexpected results — review the output carefully in those cases.
We accept all major credit and debit cards (Visa, Mastercard, American Express) through Lemon Squeezy, our merchant of record. Payment is processed securely — we never see or store your card details.
Yamaha, Korg, and Ketron are trademarks or registered trademarks of their respective owners. Rearranger.ai is an independent service and is not affiliated with, endorsed by, or sponsored by these companies. Brand names are used only to describe compatibility and conversion context.