OSC 6 - Attack

Hi guys,br
I am trying to create a basic sine bass. However i cant seem to add the 6th osc (Attack).br
You will have to excuse me i am fairly new at this lark. When i add volume or change the setting i cant seem to make a difference to the sound - Am i making a logical/sound mistake, assuming something should be happening or is there a button i am missing in the interface or some means of linking the 6th osc into the synth?br

adjust the decay… i think it defaults to turned down on most presets.

Thankyou very much!