I have been turned on to “Impulses” by Gary G. and others here (and for that, I thank everyone). After downloading the SIR processor ( free here ) I began some limited experimentation and a couple of my recent pieces have used them (as noted when used).
A few days ago, I decided to revisit one of my earlier symphonic experiments -- “Tutti – Symphonic Trance 2004-3” – and see how it might come out with an Impulse in place of traditional reverb. I selected this particular piece because the original objective of it was to illustrate as many slightly different “tutti crashes” as I could, while (hopefully) wrapping it in some additional contrasting elements. As such, I think it challenges the “hall” in which it is performed. ). The piece uses only GOS/Lite and GPO instruments.
(Brief caveat needed here: There was one high string line that somehow got a “hanging” note that would not stop sounding, so I re-recorded the line. Other than that, the piece is exactly as previously released. For that reason, the original two MP3 and WMA versions are on the page as well for comparison purposes.)
I have put together a comparison page for your examination and/or comment here: Tutti.
As the page details, there are three versions of the piece there:  the original (as released to AcidPlanet, Ampcast and Broadjam in late April),  the revised “Reverb” version (with the slightly changed string group), and  the SIR/”Concert Hall 2” impulse version. All three are available for download (or listen) in either HiFi 160 MP3 or dial-up-friendly LoFi 56K WMA. For the last two versions, the sources were totally identical and the only thing different was the Impulse or Reverb. (The precise settings for those are delineated on the page for those who care to scrutinize those.)
I am interested here in how this illustrious community perceives the differences in the Impulse or Reverb versions and which one you feel is “better”. You’re free to comment on the piece as well, but for this experiment it IS what it is, which is the “apple” that remains constant for 2 out of the 3 (times 2) examples. In all likelihood, you might not hear much of a difference in the WMA version (because of the inherent limitations in that bandwidth).
I hope this example illustrates impulses for you if you are contemplating using them. I hope to find time to do a more “scientific” test with various solo instruments in various sonic environments in the near future (mainly for my own edification, but it’s always fun to share). I would be interested in suggestions for particular instruments and ensenbles for an "experimental" piece to produce (say) 3 or 4 comparative versions, so PM or email me if you have ideas.
P.S. I wanted to also post a PDF Score for the piece (for those who like to read along) but I'm having troubles with "PDFPrint" and it not wanting to use "virtual paper" taller than 11 inches. So I've done a work-around by bringing the MIDI into Allegro and somehow printed it to a PDF there -- relatively successfully. Has anyone trailblazed that and found a way to get a taller score? If so, kindly PM or email me -- email@example.com -- and I will add that feature to the page.