Hi Ben, thanks. If by “background” you mean some formal education in synthesis then no; I got into it a couple of years ago (and wished I had sooner) and just picked up stuff by reading, listening and playing around.
I also have both the FI and the C4. Lots of classic sounds use only one or two oscillators so can often be covered by both pedals. The C4’s envelopes aren’t as flexible as the FI’s so I find that the FI is more useful if I’m trying to recreate a particular sound. C4 also has no pulse width control for the square wave so any sounds which use narrow pulse or pulse width modulation are impossible to create. I still love the C4 as there is plenty it can do which the FI can’t.
As regards size, have you seen or got one of the
@GisserD compact FI housings? They are pretty snazzy and reduce the footprint drastically.
In terms of learning, you can get the entire Sound on Sound “synth secrets” in pdf format for free.
This is also a great resource:
Learning Synths
The Moog Model D app is now free in the App Store and well worth getting. Playing around on that will help learn lots.