Claude,
I had the same problem a few months ago and somehow managed to combine two external styles by saving one in the temporary memory. Right now I don't recall the exact combination of events or buttons I had to press, but I did it. When I have time I will try again and will let you know.
Keep playing!
Andrea
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.