Something else I’ve been experimenting with, with better and better results, is using the Rotor in Logic, based on suggestions from Jim at the Organ Forum. If you combine this with the overdrive, or one of the amp simulators (‘Moving Air’ is a good one) you can get very good results, and this works very well for recording, taking the signal directly from the line-out on my A-102; I’ve been struggling with how the Vent is sitting in the mix, and the levels I get from it. This may just be related to my own setup, but I’m pretty much using Overdrive / Amp modeller / Rotor now, sometimes using Spreader and Exciter for an even bigger sound, and either the standard bus 2 platinum reverb (add other buses with reflections to taste) or a modelled reverb room.
Don’t forget to set the record mode to Latch or Write to capture Leslie-switch events (I send my CU-1 through a foot switch input on my interface for slow / fast switching).
For an example how this sounds:Simmering Slow Blues - Blues jam session