Hello everybody !

On my old PSR1500 have mandolin voice vith setup on DSP 'trill' and when I play in terca have nice strumming voice between,and that setup is Gary explain to me before 3-4 years.
I can't get this effects on s910 because vhen I hit mandolin it always struming(on one,two... note at a time ),no matter DSP on/off .I tried import mandolin from 1500,but s910 probably convert it and same thing happen.So I like to have mandolin who is strumming only vhen I play terca or accord.??
Please help. THANKS!!