Dave Smith Instruments SYNTHESIZERS

hey ,

 i made a sound which is mellow horn type . with filter envelope 
settings it  requires to sound the way it does and the way i like it i 
lose one aspect of the sound i want to have ., its becomes portamento 
sort .even though i have potramento on off . i'll try to give you 
alternative  explenation . if you have other polyphonic keys effect i'm
getting is exactly when you swich your poly keys to mono mode , it 
becomes more smooth sounding more portamento . i suspect that i might 
have to leave with it or get another evoler and make it two voice . 
would that help ? any programming suggestions ? 

thx Art