I've heard that apple that are high in acid tend to produce a distillate that is harsh and thin with lower aroma. Yet, Cognac producers seem to select grape varieties that are highly acidic as these are "perfect" for distilling. What's the deal? I've been cramming a lot of reading on wine/cidre chemistry into the last few days but have been unable to figure out whether acidic fruits (and I'm particularly concerned with apples) are better or worse for distilling--and more importantly, why they are better or worse.