The Tool Desk
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To create a convincing duet with AI, build two clearly different vocal parts, generate or edit each part separately, then align them in a DAW. Give each singer a defined range, lyric lines, entrances and harmony notes; do not rely on an unverified “duet” button.
Plan The Duet Before Opening A Tool
A duet needs musical decisions that a single vocal does not: who leads each line, where the singers answer one another, which words overlap, and where harmony appears. Write a short production brief such as: “Singer A leads verse one in a low register; Singer B answers the last two lines; both join on the chorus, with Singer B above the melody; leave a four-bar instrumental gap before the bridge.”
- Label lyrics as A, B or Both.
- Prepare a melody or MIDI line for each singer when the tool supports MIDI.
- Choose contrasting voice timbres or voice libraries, and confirm that the selected voices can sing your language.
- Decide whether the final release needs commercial rights before generating cloned or converted voices.
Choose A Tool For Each Duet Part
| Tool | Useful duet workflow | Limits To Check |
|---|---|---|
| LyricToMelody AI | Generate melodies and sung vocal drafts from lyrics or MIDI, train a custom singing voice from uploaded or recorded vocals, and export MIDI, audio and separate stems. | Starter projects are retained for 7 days; commercial rights are included on paid plans; it is a web application. Free Starter includes 20 credits; Creator is $10 per month when billed annually with 1,200 credits refreshed monthly. |
| ACE Studio | Generate singing from MIDI and lyrics, create custom singing voices, convert vocals to MIDI, and render separate tracks for the two singers. | There is no free plan. Artist provides 2,500 credits per month and one vocal-synth cloning slot; plans are billed yearly with rent-to-own access for two years. Voice and feature licensing exceptions apply. |
| Synthesizer V Studio 2 Pro | Edit each singer’s pitch, timing, pronunciation, timbre and expression precisely, using MIDI and cross-lingual synthesis across six languages. | It is a paid desktop app for Windows and macOS with a 14-day trial; it does not provide voice cloning. |
| VOCALOID6 | Generate parts from melody and lyrics, create harmonies and expression changes, and move MIDI or WAV material into a DAW. | It is a Windows and macOS desktop purchase from $225 before tax, with a 31-day trial and no free plan. |
| VoiSona Song | Edit two vocal scores in a piano roll for notes, lyrics, timing, pitch and expression, then exchange MIDI or MusicXML with composition software. | The free plan is available, while additional song voice libraries use monthly, annual or outright purchases; the listed starting price is ¥880 and varies by library. Commercial use depends on VoiSona terms and each voice’s guidelines. |
| Emvoice | Compose two MIDI-driven singers with detailed control over phonemes, pronunciation, pitch, vibrato and timing inside supported DAW hosts. | It is paid, renders through an internet connection, and runs on Windows and macOS hosts. Commercial use is allowed, including original content made in demo mode. |
| Tunela | Convert a lead or guide vocal into two custom voices, including same-gender or cross-gender singing conversion, then use its stem, TTS or video tools when needed. | It is web-only. The free plan includes 2 conversions, 2 stem separations, 3 TTS generations, 1 video swap and 24-hour history; Starter is $10.99 per month with capped usage. |
Build The Two Vocal Parts
- Separate the lyric sheet. Put every line under A, B or Both, and mark overlaps and rests.
- Create a guide melody. Enter Singer A’s notes and lyrics in a MIDI or piano-roll workflow, or provide lyrics where the selected tool generates from text.
- Create Singer B as its own part. Use a reply melody, a harmony interval or a contrasting rhythm. Keep the second part in a comfortable range for its chosen voice.
- Generate short sections first. Make one verse and chorus before processing the full song so pronunciation, timing and voice contrast are easier to correct.
- Render separate audio. Keep A and B on different tracks or stems. LyricToMelody AI and ACE Studio explicitly support separate-stem or separate-track workflows; for other tools, export each part independently and verify the available format.
- Edit entrances and overlaps. Fix consonant timing, breaths, held notes and words that collide at the same time. Synthesizer V Studio 2 Pro, VoiSona Song and Emvoice provide the detailed note, lyric and expression editing described above.
- Balance the conversation. Place the lead nearer the center, automate level changes when the singer switches, and check that the shared chorus remains intelligible on headphones and smart speakers.
- Export and review. Listen for doubled consonants, unnatural unison vibrato, abrupt voice changes and phase problems before publishing.
Practical Duet Prompts And Inputs
Call And Response
Prepare lyrics with labels such as “A: I take the first train,” “B: I meet you at the station,” and “Both: We arrive together.” Use the labels as your arrangement map; enter each singer’s lines separately when the product does not document multi-singer text input.
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Harmony Chorus
Write a single lead melody, duplicate it for Singer B, then change selected notes to a harmony. MIDI-capable tools such as LyricToMelody AI, ACE Studio, Synthesizer V Studio 2 Pro, VOCALOID6, VoiSona Song and Emvoice can use that note-based approach. Check each vendor’s documentation for supported harmony intervals and languages.
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Converted Guide Vocal
Record one clean guide performance, duplicate the performance for the second part, and use Tunela’s singing conversion for the alternate voice. Confirm that the service accepts your source length and that your chosen voice may be used for the intended release.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Consent, Voice Rights And Release Checks
- LyricToMelody AI: Get permission before uploading or recording a person’s vocals for custom singing-voice training; commercial rights are included on paid plans, while the free plan’s rights are not stated.
- ACE Studio: Obtain consent for custom voice cloning and read the voice- and feature-specific licensing exceptions before commercial release.
- Synthesizer V Studio 2 Pro: It does not provide voice cloning; check the license for the selected voice and your release use.
- VOCALOID6: Check the terms for each included voice and any vocal-style replication before distributing the duet.
- VoiSona Song: Commercial use depends on VoiSona terms and the individual voice guidelines.
- Emvoice: Commercial use is allowed, including original content made in demo mode, but follow the product and voice terms.
- Tunela: Obtain permission for any uploaded singer and custom voice, and verify the service’s current conversion and commercial-use terms.
When a feature, language, export format or licensing condition is not stated for your exact voice or plan, check the vendor’s current documentation before you publish.
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