I tried it in my Tyros4, Gary, and it works fairly good, although it wasn't recognizing some of the more complex chords I tried with it. The bass line was fine, as were the strings, although the latter could have been a little more prominent.
Also, what makes recording the guitar chord parts, is that playing Mega Voices by hand is very, very difficult, to say the least.
Your style could benefit from guitar parts to flesh it out, and that's where Style Assembly makes it easy as the Mega Voices are already nicely controlled with velocity, although you can change it by going in the Groove & Dynamics section quite easily to get the right effect. Also the guitar parts can be voiced using the NTT settings for stroke or arpeggio.
It's very difficult to get the little details right, and, in my own experience, they are what set a great style apart from a good one. That's why style programmers use a special sequencer based program, as it allows them to tweak mega voices, and let's face it, those sounds are what give Yamaha's styles the edge in realism, in my opinion.
I've done styles a long time ago from scratch, but, I'm more than happy with the results I get from using Assembly, and I find it a lot easier overall.
And, I certainly appreciate the skill those style makers have a lot more.
Thank you for braving the firing line and sharing your "from-scratch" style.
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.