@Another User said:
"Other stuff like synths, hybrid percussion, guitars..." etc would require the MIR Pro, though... :(
Not necessarily. In fact, it can also be a terrible idea, depending on what you're doing. Things that come alive in a space, yes - Taikos and whatnot ... but honestly, not having MIR Pro shouldn't stop you from using those instruments anyway. Just make them sit in the mix, who cares how you did it as long as it sounds good?
But not every musical element of a hybrid score should "sit in the space". For example, unless it's for some kind of moody special effect or something ... you DON'T wanna hear recordings of electric guitars on a scoring stage or concert hall. That's terrible. Typically you'd close-mic the cabinet, double- or even quad-track all the parts and pan them way left and right. Stuff like reverb and delay are added via effect units/plug-ins when needed.
Electric bass is even more detached from any kind of "space" most of the time, as it's actually being recorded directly into the recording device, without even micing an amp.
A drum kit surely benefits from a nice sounding space - depending on the style and the type of sound you're after - but even here, we're more like talking about a nice studio space, perhaps a facility with a high ceiling, and using a number of additional room mics in addition to the standard close-mic setup. But you most certainly don't wanna hear a great rock or funk drummer doink away somewhere in the back of a concert hall ... 😃
I don't see why anyone would want synthetic sound sources to sit in some kind of "natural" ambience either. It's completely counterintuitive. Just imagine how silly that wound sound.