Hey, EVP88 is great, and it responds naturally, because unlike a sampled instrument, its a real emulation of the hardware's physics. So, you are right about it not supporting mono, but good news its possible to use in mono if you do this:
•Â instantiate in stereo (only format available)
• open up the elephant skin cover
• set the Stereo Width to zero (counter clockwise 100%)
• set the tremolo stereo phase to zero (counter clockwise 100%)
So, now doing this makes the output mono (you can verify with Logic's Multimeter plug-in Goniometer mode)
• to make the format of plug-ins change in the inserts, you need to force a mono plug-in to load. You can use almost any plug-in. I recommend the simple Gain plug-in. Uses little memory,etc.
• press and hold the option key while clicking and holding on the insert slot, it will show you several new options at the end of the hierarchical list you may not recognize. This includes MONO and MONO > STEREO, choose MONO.
This has the effect of turning the format of the channel to MONO within the inserts. Now all subsequent plug-ins you add will try and load their mono variants.
Try loading Pedalboard next, it works very well in Mono and can give you that authentic retro EP > Stompbox sound.