HI there,
Me again.
Two things to check :
On 6000, set right 1 as Solo Trumpet.
1.Press PROGRAM MENU button.
Select CONTROL then OVERALL TOUCH SENSITIVITY. Scroll down to AFTER TOUCH and switch to ON if shown as Off.
CURVE needs to be at about 5 or higher to show significant change and THRESHOLD at 20.

2. Exit back to PROGRAM MENUS.
Select SOUND then PART SETTING. Right 1 should show Solo Trumpet.Scroll to page 3 and check that AFTER TOUCH is ON.

Press a key and hold it down then increase the pressure on that key and you should notice more vibrato in the sound.

Hope this is successful.
Greetings, Derek