tyroschuck and Diki:

You can edit the Velocity Effects on Tyros:

The SA effects will still be present if you strike the keyboard in certain ways even if the ART buttons are off. If you want to eliminate them you need to select Voice Set and decrease the Depth and Offset parameters. If those are set low it will be difficult to trigger the effects even if you strike the keyboard hard on certain notes. Conversely if you increase these parameters you will trigger the effects very easily and often.

Joe