How to turn your own melody into an instrumental arrangement

You can use a short recording of your own melody as a reference for a new instrumental arrangement in SoundToMIDI. Choose a style, upload the recording and generate an MP3. One generation costs 5 credits and requires sign-in. The result may change the melody, timing and length. It is a new musical interpretation, not your original recording with a guaranteed backing track added underneath.

If you need editable notes instead, use the free humming-to-MIDI converter. That workflow transcribes a recording into MIDI on your device. It does not compose an accompaniment. Decide which output you need before spending credits.

Start with one complete phrase

Record a melody you wrote, or audio you have permission to use. A phone voice memo, a solo piano phrase or a single guitar line can serve as an input. The current arrangement page accepts MP3, WAV, M4A, OGG, FLAC, AAC and WebM files that your browser can decode, 8–120 seconds long and no larger than 25 MB. These are upload limits, not a promise about output duration.

Use a quiet room and a comfortable recording level. Listen back before uploading: can you hear where the phrase starts, which notes matter and where it ends? If the recording crackles or the tune is buried beneath another song, record a cleaner take. For an initial test, one clearly stated phrase is easier for you to evaluate than an entire unfinished song. Do not add long silence just to meet the minimum length; record enough of the idea to make an eight-second or longer phrase.

Keep the original file. You will need it when comparing the generated result. A phone recorder may offer an export or share-to-files command; save the actual audio file before opening the arrangement page. SoundToMIDI’s arrangement form currently selects a file—it does not have an in-page microphone recorder.

Hear what a style change can produce

These examples were generated in SoundToMIDI from the same original synthetic eight-note melody. The source is a test recording we made, not a person’s hummed performance. The four outputs are fixed demos generated on October 20, 2026. They let you compare actual outputs without signing in or spending credits; they do not predict how your recording will sound.

Original source Download the original test melody.

Soft piano — about 32 seconds

Acoustic folk — about 38 seconds

Lo-fi groove — about 52 seconds

Cinematic strings — about 30 seconds

Listen for more than the instrument name. Does the phrasing leave space for the tune? Does the new rhythm suit the idea? Can you still recognize the part you wanted to keep? These questions matter more than whether the generated track sounds polished. We have not measured note-for-note fidelity or a success rate from these demos.

Create your first arrangement

1. Open Music arrangements. Under “1. Find your sound”, play the fixed demos and select one of the four style cards. The image suggests a mood; the audio is the useful reference. Playing a demo is free.
2. Choose “Sign in to start” if needed. Check your shared balance. You need at least 5 credits before selecting your source audio. If you buy a pack, return to the arrangement page with the same account.
3. Under “2. Bring your melody”, select your audio file. Wait for the browser to prepare it. If the file is rejected, check its duration and size first; use a WAV or MP3 export if your browser cannot decode the original format.
4. Read and accept the audio-rights and cloud-generation consent. This step uploads audio for cloud processing. The separate free MIDI converter remains browser-local; the privacy behavior is different.
5. Select “Create arrangement” once. Leave the request to finish. If you return later, use the same account and check “Your arrangements” before starting another request.
6. Listen to each delivered version. A successful request normally supplies two versions; all versions returned for that request are included in its 5-credit charge. Use “Download MP3” on the version you want to keep.

Save both the source and the chosen output. Use filenames that distinguish the original from the arrangement, especially if you plan to bring them into a DAW later. The downloaded result is mixed instrumental audio, not a set of editable instrument tracks.

What the credits buy

SoundToMIDI uses one shared credit balance for arrangements and project exports. The one-time pack is 100 credits for US$4.90 or €4.90 in the supported checkout currency. Credits do not expire; there is no subscription. At 5 credits each, a pack covers 20 arrangement requests, 20 project export unlocks, or a mix totaling 20 operations. Check the amount and currency on the pricing page before paying.

New accounts currently receive 5 welcome credits. Those can cover one arrangement or one project export; they are not separate allowances. If you already used them on an export, the same credits cannot also fund a generation. Re-downloading a completed arrangement does not start a new generation. Choosing another style and generating again does.

A confirmed technical generation failure returns its credits. A completed result that is musically different from what you hoped for still costs credits. Listen to the free examples and decide what degree of change you can accept before generating several versions. Credit restoration is different from a cash refund; contact support for a billing issue rather than repeatedly retrying a pending job.

Check the result before using it

Compare the opening phrase and its ending against the original. Then listen through the whole result: the beginning can be recognizable while a later phrase changes direction. Check for unwanted vocal-like sounds, abrupt endings or a rhythm that no longer fits your project. The preset requests instrumental music, but you still need to assess the delivered audio.

SoundToMIDI does not provide chord names, a chord chart, separate stems or a MIDI arrangement from this operation. If you need the original tune preserved as editable notes, transcribe and correct it in the free converter instead. If the new version has lost the part you cared about, use the melody-change troubleshooting guide to decide whether to improve the input or switch workflows before paying for another try.