Smule Upload Helper

Detailed Description
Smule Upload Helper is the ultimate tool for Smule creators and audio enthusiasts. It allows you to dynamically replace the default "minus" (instrumental) track with your own custom "plus" (vocal or mixed) track directly inside the Smule web player while uploading an arrangement.

If you use tools like Ultimate Vocal Remover to process, mix, or extract vocals before uploading, this extension is a lifesaver. It lets you perfectly align and preview your processed audio with the lyrics before you publish your arrangement to the world.

Key Features:

🎵 Instant Track Substitution: Drag and drop your custom .mp3 or .wav file to replace the default track on the fly.
⏱️ Millisecond-Precise Sync: Fine-tune your track's start time (±2000ms offset) to ensure your vocals align perfectly with the on-screen lyrics.
🎚️ Advanced Audio Controls: Adjust Fade-in, Fade-out, and Volume offset to get the perfect preview mix.
🔄 Seamless Switching: Switch back and forth between the original "MINUS" track and your custom "PLUS" track with a single click.
🚀 Flawless Integration: Deeply integrated into Smule’s interface. The extension survives page navigations and automatically bypasses strict CORS restrictions so your audio never mutes unexpectedly.
💡 How to Use:

Start the upload flow for an arrangement on Smule.com.
Proceed to the Lyrics or Sync stage.
Click the floating purple ⚙️ Smule Upload Helper button hovering above the audio player.
Upload your custom track and magic happened, now you can switch between PLUS (your vocals track) and MINUS (your pre-uploaded instrumental track)
Adjust the sliders until your audio sounds perfect!
Note: This extension works entirely locally in your browser and does not collect or transmit any of your personal data or audio files.