Here are some free voice modulation software options that you can use to change a song’s vocal to mimic your own voice:
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Audacity: This is a powerful open-source audio editor that allows you to manipulate audio files in various ways. While it doesn’t directly convert vocals to your voice, you can use effects and pitch shifting to modify the audio.
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Vocal Remover Pro: While primarily aimed at removing vocals from songs, it can help you isolate the instrumental parts, which you can then sing over and mix with your voice.
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GarageBand (macOS): If you're a Mac user, GarageBand is a free digital audio workstation that allows for various vocal effects and pitch adjustments. You can record your voice and layer it over the instrumental.
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Voxal Voice Changer: While this software is more focused on real-time voice modulation, it allows you to apply effects to your voice while singing over music.
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VoiceMeeter: This is a virtual audio mixer that can help you manage audio inputs and outputs, allowing for real-time mixing of your vocals over music with different effects.
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Ocenaudio: This is another free audio editor that provides a user-friendly interface and various effects to modify your voice recordings.
While many of these applications provide powerful features for free, some may have limitations in their free versions, such as watermarks or limited effects. Always check the licensing details if you plan to use the software for any commercial purpose.