# Mono / Stereo Converter — yeezhan.com
> One-time pay-per-task emergency tool to make your file ready for submission.
> No credits, no balance. One payment unlocks one task result, valid for 24 hours.

Tool domain: https://audio-channels.yeezhan.com
Skill definition: https://audio-channels.yeezhan.com/skill/SKILL.md
API documentation: https://audio-channels.yeezhan.com/api/docs

## What this tool does
Downmix stereo to mono or upmix mono to stereo — fix channel-spec rejections in one pass.

## Typical user problems
- Telephone systems, podcast feeds and some ASR pipelines accept mono only, while music platforms want stereo. A real channel conversion (summing for mono, duplication for stereo) satisfies both specs instead of a metadata flag players ignore.

## Parameters
- mode: enum, required. 目标声道

## Pricing
- Watermarked preview: free, no login required
- Final clean output: $0.99 one-time per task
- Require login (email/phone OTP) to complete payment
- Result available for download 24 hours after payment

## Limitations
- Max 200 MB