mike_mccue
I've heard enough real Leslies to think that hoping to emulate the sound on a recording is wishful thinking.
Spot on, Mike. To the best of my knowledge, nobody has ever truly replicated the Leslie effect, neither electronically nor digitally.
However, I would also offer two other points about authenticity.
First, nobody has ever truly captured the Leslie effect in a recording, either. Even the best, most iconic Leslie effects we've heard on records don't sound the same as they would live. As soon as a microphone (or two, or three) enters the picture, you get something different. Still nice, but different. It is, after all, a purely acoustical effect.
Second, I would not hesitate to use a good sim even if I had a real unit in the room, because miking Leslies is a pain. You need some distance to capture the Doppler effect and room interaction, and to avoid having mechanical noises and whooshing air dominate the track. That means putting the Leslie in another room or re-amping, which deprives the performer of interacting with the Leslie, as it is an instrument in itself. And no matter where you place the mikes and how you angle them, you can't change your mind later. Not to mention the need for a bright, reverberant space to record in, a luxury few of us have.
So authentic or not, digital emulations are fine with me. I've spent a great many hours listening to Leslies whoosh behind me and I love 'em. I've also spent a fair amount of time hefting them up stairs and into vans. And repairing them. And chasing dancers away from them. And drummers who want to set their beer on them. Like an ex-lover, I miss them and I don't miss them.