I think it's very difficult to capture a "sound".Don't forget you just taking 1 point.Amps speakers and mics are usually not linear so you will be missing like 100 other points.It will sound different at lower and higher volumes,it will sound different when you play with a lot of dynamics etc....
I've been playing around with a lot of plugins lately,my last one was positive grid.Now it sounds not bad when you're playing around with it but if i go back to my "real" rig then it's WTF,the real deal sounds a lot better every time.It's nice for recording maybe since you will do a lot of processing but live i would never use it.My 2 cents.
It doesn't seem that hard from what I have read. I'll give it a go and let you know. Are going to try it Richard? I imagine if you are only after the speaker sim in your MP2 then you will need to send a sign WAV through the input with all other effects off, and basically only the speaker sim engaged.
I can't comment on your experiences MJ but I find the sounds I have with my IR device sound great with nothing done to them. Best sounds I have ever got. The processing I used while making the bands single for example was minimal and was purely to get it to fit in the mix. I used IR's on that project. But is this not a normal thing to do? It seems to be otherwise all the information I have read about mixing music is wrong. So for example I stripped a lot of lo end off and hi end with Hi and Lo pass filters. Had I recorded my speakers for real I'd have done the same thing. In fact I may have done more to the real mic and speakers recording because I can't adjust as easily as I can with speaker IR where I can surf through hundreds of speakers and mic positions if I want to.
Yes I can see that if you made a speaker impulse you would get different results at different volumes. Not sure I understand what you mean about the 1 point but missing 100 other points.
The way I see it is, set the volume to a volume you normally play at, send the sine wav through your rig exactly as it is when you normally play and record. Make a few recordings with the mic moved and a few other variations if you want to and then create the IR's. If the commercial IR's I use only take 1 point then I'm very happy with those one point IR's. End of the day it sounds like I'm playing through speakers to me and that's all I want to hear.
I'll record my live rig at my normal at the weekend and see if my results equal my impulses. Live righ sounding good these days but I think the IR's sound more "pro". I use these mic's ES-57 on the guitar cabs
http://www.speakerrepair.com/page/product/37-206.htmland before anyone thinks "he's using a cheapo rip off SM57" do your research on the mic.