after listening to a few bars of this, I realised Brahms had risen from the grave and I rushed to put this MIDI file into Overture, set it to Kirk Hunter solo strings and the Kontakt 2 piano so i could really listen to it. I'm still recovering from the excitement of hearing something that, to me, is actually even more enjoyable than one or two at least of the old master's chamber works. The level of fluency is astonishing and though I could no doubt find things to grumble about if I really wanted, I don't want to at the moment. This is some achievement!
PS if you don't already have a reasonable audio rendering of this, I will happily create a file from my mockup and send you it if you like (I have not changed anything --merely tried to get reasonable overall levels though there are certainly some balance issues) .