many thanks Jbaent.
really enlightening itw
About the T.Mandel /J.De Korte confusion, it was me who re-introduce (in good faith) the wikipedia mistake here on AMIT forum.
I know now that it's not true, with the help of you all here !
However, it's always a mystery to me why J. de Korte is credited in film end credits, and Tommy Mandel is not
I think it's fair to say that Mandel's role was a litlle bit more "important" than JDK's one
I must confess that I don't hear clearly JDK's parts, apart this one : the "congas" sound at the beginning of telegraph Road which can't not be hear in Alchemy, but is present in the MFN compilation remix