Dave Smith Instruments SYNTHESIZERS

hi, i've bought the (mono) evolver's pc editor, when 'initialising' a
program to build a sound from scratch, i'll set all the osc and amp
envelopes. yes there is sound when i play but it drones constantly and
the amp envelope seems to not stop this.. any idea whichparameter i'm
forgeting to turn on or change?

any help appreciated,
 Luke