I'm trying to get a really good B3/leslie effect and tried the following. I assigned one set of draw bars to voice #1 and a different set of draw bars on voice #2. Both are set with the leslie DSP on and initially slow speed. When I hit the DSP effect button to change the speed, it appears that only the voice # that is lit changes speed while the unlit voice does not. I have owned the fabled B3 with 122 leslie and can't seem to reproduce the slow speed leslie with chorus effect.

Has anyone been able to get the sound I'm looking for or am I trying to do something that is not possible?