The BK-9 actually has FAR better guitar sounds in it than the COSM one he was using. A bit too much over the top except for Van Halen or hard rock. Even the live guitarist there didn't have THAT much searing lead sound!
But there are some really killer sounds (he could have got MUCH closer to the guitarist's sound) in there, with clean and amped up Tele's, Strat's and some decent Les Paul sounds too.
The SearingCOSM patch is only the very first patch in the electric guitar section. There are dozens. He might have taken the time to scroll down a bit!
But the real icing on the cake is to take the SuperNatural Electric Guitar patch, then feed it into an MFX amp simulator, slap some delay on it, and totally rock out! It does the same tricks the acoustic SN guitars do, easily separating chorded playing from solo lines, recognizing hammer on's and off's, switching harmonics in, etc..
Although the bare patch is kind of Jazz Guitar, all it needs is to be fed into an amp sim, crank up the distortion a bit, EQ to taste, and you've got a rock/blues patch that betters any in the regular E. Guitar section.
Think I might have to do another little demo soon, show you guys that Roland can rock!
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An arranger is just a tool. What matters is what you build with it..!