Hello there.

How do you mean processing or temporary processing? Like processing from the computer?

I've been using a 2nd gen 2i4 for a long time before I got this one.
The 2nd gen 2i4 has an input/playback mixer nob that lets mix between the computer's output over USB & the direct-input from your mic/instrument.

On the 4th gen there is no knob for this, but you can toggle direct, both, or just output form the computer.

A main issue I have with the 4th gen that I forgot to mention in my video is that the volume nobs for the mics are digital or "infinite" nobs. Meaning they turn forever in either direction.
It's a bad design choice because you want to know for certain how far turned up your input signal is because you'll often want to use it at the same volume.
The reason they changed it is because of the "Auto" function that listens to the signal and tries to set it to a good level. Plus there's just a lot more digital stuff in general.

Do you use your 2i2 with a phone/tablet?
I've never tried that, but I have an Android.
iPhone's are usually the ones used for recording music because Android has this round-trip latency issue. I know Samsung's top phones had a real-time driver for them that corrects the latency issue. But that's been years ago when I read about that.
I know they sell a lot more gear for iPhone/iPad music recording like i-Rig.
Do you have a 5v plug in the van?
There's something called a "1Spot" that lets you plug in like six 5v devices. It's designed for guitar-pedal boards so they can all be plugged in at once.

Nice to meet you as well.