Ian,
I'm sure Donny was poking fun at me. I have a pet peeve about using midi as a stand alone noun, instead of an adjective. I never say "a" midi ... always a midi file or an smf, or something like that. I'm an odd duck, I know, but I rarely use the word gig (I prefer work) and I don't play midis... I play midi files....sometimes.
So, when you gig you don't use midi's...sometimes...Ha ha.
The usage of "midi" as a noun, meaning SMF, is quite widespread...it seem to more prevalent among guitarists (I sell/demo a lot of arrangers to OMB Guitarists) but many keyboardists (including yours truly) use it...I probably got in the habit because I deal with so many guitarists, and it's easier to go with the flow, than try to re-educate them.
"Gig"...some people just don't like the sound of the word itself...I have a lady friend who hates the word "deuce" (in card playing)...I tend to use "gig" and "work" interchangeably, as they both mean the same to me.
I
never use midi files when working...I just like using the styles...yes, it's harder to play tunes "exactly" like the original (
even with song specific styles) but, I generally don't play in that way, and tell those who want the exact recording, to buy the CD of the original...plus, being an instrumentalist tends to give me more elbow room when it comes to gigging...er...working.

Donny has asked this question several times about "midis"...I think he uses them quite a bit at his gigs...er...his shows.

Ian