---
title: "Fail the pair check before you spend a free try"
url: https://memory.wiki/Fh3dYyDe
updated: 2026-11-07T09:46:16.025Z
source: "cli"
---
# Fail the pair check before you spend a free try

MashupMaker runs a pair check before stem separation. A tempo gap over 12%, a key gap over 5 semitones, or an unreadable tempo rules the pair out and nothing is charged.

1. Use the free Key and BPM Finder on both tracks first.
2. If tempo differs by more than 12% or key by more than 5 semitones, pick another pair.
3. Only then upload MP3, WAV, M4A, OGG or WebM and tick the rights box.

An uncertain key read still gives the mix, with a note to nudge the vocal a semitone. Open the [Key and BPM Finder](https://mashupmaker.net/key-bpm-finder) or [MashupMaker](https://mashupmaker.net/).

MashupMaker at mashupmaker.net is not affiliated with other apps or websites that use a similar name.


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## Summary
MashupMaker automatically performs a pair check before stem separation to ensure compatibility. If tracks exceed a 12 percent tempo gap or 5 semitone key difference, the pair is rejected and no free try is consumed.

## Themes
- MashupMaker usage guidelines
- Pair compatibility checks
- Cost saving strategies

## Key takeaways
- MashupMaker performs a pair check for tempo and key compatibility before initiating stem separation.
- A pair is rejected without charge if the tempo gap exceeds 12 percent or the key gap exceeds 5 semitones.
- Users should use the Key and BPM Finder tool on both tracks prior to uploading files.
- Supported file formats for upload include MP3, WAV, M4A, OGG, and WebM.
- An uncertain key reading will still produce a mix but requires the user to manually adjust the vocal by one semitone.

## Insights
- The system prevents unnecessary charges by validating track compatibility before processing begins.
- Users can bypass potential failures by utilizing the free diagnostic tools provided before uploading files.
- The platform maintains a distinct brand identity separate from other services sharing similar names.

## Open questions / gaps
- What specific criteria define an unreadable tempo?
- Are there any limitations on the number of free tries available per user?