basically run thru the mixer's options and choose 2 have the aux send as pre-fade (normally it works as post-fader, so even if u cranck up the sends, when u lower the dry channel u are also lowering the amount of that channel that is being sent 2 the efx... lets just say that in pst-fader the aux send is no mor that the balance between dry and wet signals.. moving the fader keeps this proportion!)

Z