Don't know about Winwood but the OBxa (brass patch) was the opening riff on JUMP. Paul Schaffer still uses his OB occasionally on Letterman. Here is an article I clipped for you which may be what you are looking for-even though it is not Oberheim..... <g>
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Re: [oberheim] Searching for a Synth
2004-11-29 by Charles Massey