I have an L103 too...I use it a lot.
Here's my patented "trick"...and you don't need no stinkin' guitar amp tremolo!
Set your Hammond sliders-n-tabs to whatever sound you want...add some of the onboard Vibrato & Chorus (light or full)...record with one mic between the speakers and about a foot or two back. I know that might be difficult since the speakers are underneath and the bench and your feet can be in the way, so do as best as you can with mic placement.
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Aside:
I bought a spare set of identical Hammond speakers from an L-Series on eBay...and then I got a Lopo 212 cab, dropped the spare set into it and then I disconnected the onboard speakers and ran a new/longer speaker wire to the external speakers. That allows me to easily mic the Hammond without fiddling underneath the bench with a mic. Also...it minimizes the keyboard finger noise, as the whole Hammond console is rather resonant, and your finger tapping gets easily picked up by the mic when it's right underneath the keyboard.
***If you do this...make sure you ALWAYS have that external cab connected to the Hammond before powering it up...otherwise you will kill the tube amp inside!***
I put a label next the Hammond's power switch "CONNECT SPEAKERS" as a reminder to always check before throwing the power switch.
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Now...once you have that one track recorded, simply copy it in your DAW so you have two identical tracks one above the other. Zoom in so you can actually see the up/down vibrato of the sound waves. Take one of the two tracks and slide it slightly to the right so that the center of it's UP wave cycle is directly lined up with the center of the DOWN cycle of the other track.
You want to only slide it to the right for half of one cycle...not more...though you can, but the further you slide to more smeared it can get on the leading attacks of the chord/note changes. Try it, you'll see what I mean.
TRACK 1: UP DN UP DN UP DN
TRACK 2:.....UP DN UP DN UP
(If you’re not getting what I mean…I can upload an image from my DAW of my Hammond tracks.)
Then pan Track 1 hard left and Track 2 hard right. Sit back and dig the nice L<--->R tremolo action.

(It makes no difference which goes L or R...but the tremolo will come from that "leading" track on the chord/note attacks.)
If you want to apply some reverb or other/additional processing to the tracks...knock yourself out...but they sound good as-is without cluttering up your mix.
