Craig and AT had the right idea!
Here is Overloud's response........
The 126 IR pack is not the same as the REXP library.
The 126 IR are expansion packs, Big Room Pack and Small Room Pack, have been engineered by Dan Gonsalez.
You can load those IRs in REmatrix Solo or REmatrix as user IRs, but they are intended to be used alone- singularly.
REXP, instead, is a multi layered IR library tailored for REmatrix.
The presets coming with the library make use of the IRs “the REmatrix way”, which means that you’ll be able to model the final reverb by trimming up to five layers of components. So this is really a different approach if compared to the single 126 IRs expansion pack.
This is just to describe the difference between the two expansion IR libraries.
Hope this helped. Don’t hesitate to email me back in case you have further questions.
Best Regards,
Alfonso De Prisco
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So, there is the definitive answer!
Craig....... I look forward your CGI spaces! Years ago, I bought a Carvin SX50 amp, after reading your bit about it being " an idealized overdrive sound"(I'd buy another if I could find one like I had. Blonde tolex 50watt). I enjoyed that amp a lot and if your new IR's are your current pet project, I want to get them, too.
Michael