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I have a plg150an installed in an s80. When using the plg150an board, 
the s80 has a default setting of Mwheel>pitch mod>10. This setting is 
adjusted in the host synth (s80).  If there is a control edit screen 
on the AN200 itself, try looking there, and set the Mwheel>pmod 
amount to 0.  Another thought(I haven't tried this); maybe you can 
counteract the hosts' default vibrato setting by making a control 
matrix assignment in AN edit: Mwheel>pitch mod> -10.