Comment 14 for bug 1947908

In case of Pioneer DJ DJM-750MK2 Dub Echo it is:
Left Side: Echo + Band Pass
Right Side: Echo + High Pass

The Pioneer DJ DJM-750MK2 has NO dry/wet control in the Quick effect region.

From the Manual:
"
2 Turn the [COLOR] control. The effect is applied to the channel for which the control is turned.
The effect’s quantitative parameter can be adjusted by turning the [PARAMETER] control.
"

It is the [COLOR] control is our Quick effect meta knob. The Parameter knob adjust one additional parameter.
See: https://youtu.be/pDOO4dckuL0?t=281

Here the details:
https://www.manualslib.com/manual/1294477/Pioneer-Dj-Djm-750mk2.html?page=14

Here a detailed demonstration of the DJM900nexus https://www.youtube.com/watch?v=aI8uueOlhIE
It is powerful, simple to use and accessible without special knowledge about effect.