Authentic to what market..? I can't imagine that a Cumbia in Portugal is the same as one in Costa Rica, which is probably different to one in Brazil, and your mother's Salsa beat is probably nothing like your grandkids' Salsa.

What age group and country are you thinking of when you look for a Son? Or a Samba? There are 22 different Cumbia's in the GW-8L. How many come with the Audya?
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An arranger is just a tool. What matters is what you build with it..!