Qa Engine

• Verify sound quality using all methods
• Vinyl Emulation - slow track down to 75% or so and listen for crackles on sharp transients
• Pitch-Independent Time Stretch

Engine QA Checklist

This page is a checklist for ensuring that the Sound Engine is working as intended.

Reference Test Grid

Behaviour to Test	Vinyl Emulation	Pitch Independent Time Stretch
Pitch Shift a Track down by 90% [1]	?
Pitch Shift a Track up by 90% [1]	?
Pitch bend a track down to the minimum with 90% pitch range [1]	?
Pitch bend a track up to the maximum with 90% pitch range [1]	?
Pitch shift a track up and down with 90% pitch range [1]	?
Mix a track at 121 BPM on deck 1 with a track at 120 BPM on deck 2 by shifting the pitch on deck 2 by 0.8% [2]	?
Mix a track at 146 BPM on deck 1 with a track at 145 BPM on deck 2 by shifting the pitch on deck 2 by 0.7% [2]	?

[1] Listen for crackles, sharp transients or harmonic distortion [2] Beat should be in sync for a decent amount of time but not perfect.

Mixxx 1.8.0 Test Grid

• Test With:
• Mixxx 1.8.0, BZR rXXXX
• Qt X.Y.Z (whatever is shipped on OSX and Windows with Mixxx)