I've got a Nord electra 3 and a Leslie 760...I have a footswitch for speed and preamp that hooks to the footswitch which plugs to the leslie...my problem is that the leslie doesn't seem to have the power it should...think I need a larger preamp? can I use a small guitar amp as a preamp?....don't know much about electronics...the leslie changes speed as it should with the footswitch but the sound is not near what it should be in volume and power....it should be a lot stronger I think. thanks for any help...george