Comment 1 for bug 1407126

My view on this is like that:

a) Key = de: Tonart
https://en.wikipedia.org/wiki/Key_%28music%29
A track property = Original Key
In case of a pitched track = Current Key
(All tones a pitched by the same amount the mode (Minor/Major) is unchanged
Linear Pitch: this is what a turntable can do change the turning speed, tempo and pitch changes with the same ratio.

b) Pitch = de: Tonhöhe
https://en.wikipedia.org/wiki/Pitch_%28music%29
Pitch = 0 track it at its original key

c) Tempo = de: Tempo
https://en.wikipedia.org/wiki/Tempo
Measured in BPM
Mixx has no dedicated independent Tempo slider, but it can adjusted by the Speed slider independent from pitch when keylock is enabled.

d) Speed = de: Geschwindigkeit
This is what is labeled as "pitch" on turntables. We drop the word in Mixxx for it, because we can change pitch and tempo independent. The Speed slider does not effect pitch if keylock is enabled.