is it possible to set a specific scale in midi piano roll?

Cubase
1

Does cubase have a function whereby in the midi piano roll, you can specify a scale so that only those notes get played?

2

No.
You can use a chord track and limit the input to chord or scale.

3

Thanks for the reply - is the ‘limit the input to chord or scale’ function found in the inspector of the chord track?

4

You can also set the Note’s Color to be based on the Chord Track instead of the default Velocity.