This article deals with keys that feel the same physically/mechanically but show irregularities regarding how they control sound.

If you feel that a key reacts differently to sideways bends than other keys, e.g. reaches the maximum bending interval too soon or not at all, or is inconsistent in its pressure/aftertouch travel, then you should try a manual calibration of the key.

Press the "m" button (mode button) to go to mode selection screen -> global settings ⚙️ -> 'calibration tab' and launch the 'key calibration assistant'

The procedure will be explained on-screen.

Tip for better calibration

The pitch bend gesture is meant to be performed by pushing on the side of the key, towards the left or right, rather than pressing on the top of the key.

Calibrating this way makes the response more precise. If, after calibrating, a key feels more sensitive to pitch bend than you would like, you can also fine tune this via the sensitivity curve in the sensitivity menu to adjust how the keys respond.

Note that the calibration itself only adjusts the specific key you are touching, so there is no risk of it affecting the rest of the keyboard.

Why does a key sometimes need calibrating? Is this a hardware fault?

Occasionally needing to recalibrate a key is entirely normal and not a sign of a hardware defect, even on a brand new instrument.

Each Osmose is calibrated at the factory by a robot, and much like a guitar that needs tuning from time to time, slight variations can occur and a key may need recalibrating.