Lawrence wrote:just a couple of minor points
Firstly...using a real amp will feel better if you are in the room with it because you are familiar with that. It will not sound better in the mix than say...any $500+ modeler from the last 15 years. Recording in the control room will feel odd if you are not used to it...BUT, your ears will last longer, the communication with the engineer will be better, and monitoring via speakers is much nicer than wearing headphones.
secondly...if it is an actual studio environment...perhaps trust the engineer to do their job.
As an ex-engineer, this advice is gold
For the future, make it to pre-production meetings. All this stuff is discussed then and all questions answered. You get to know what can be done with the resources at hand, the time and your budget. You get to walk through the facility and get the vibe of it. Recording environments can be quite intimidating and sterile places to perform in so it's good to feel at home as much as possible before you're expecting to put on the performance of a life-time. Engineers don't really like to get involved in managing the talent, that's more a producer's role, so you're going to have to bring some thought to the table to get your best performance.
Capt. Black called it regarding bleed from sources into other mics. It's not too critical depending on genre. Lawrence called it regarding the ability of a good engineer to mitigate bleed to an inconsequential degree and the interplay between SPL/tone/comms/hearing/fatigue/comfort/etc
Tape can make you feel like a bug under a microscope. Try not to get "paralysis by analysis" syndrome. Have fun with it as much as you can
and DON'T piss off the engineer! BUT have good, clean, professional fun
Good luck