Domantas:
I've tasted a fair amount undeodorized cocoa butter and I can tell you from my experience that the butter does have a taste of its own and it depends on the recipe and other factors whether the taste and aromas of the undeodorized cocoa butter have any effect on the finished flavor and aroma of the finished chocolate. You would have to experiment to find this out.
As I pointed out in my response to Brian, I personally don't think (and I actively advocate for this view) that you can't call a chocolate made with beans from one origin and butter from another origin as "single-origin."
Another thing to consider in the butter debate is that butters from different regions have different ratios of the fatty acids that make up the triglyceride structure. This leads to different melting points (or hardnesses). If the butter you are adding has a different melting point from the butter in the beans you're using, this blending of fat melting points can result in a chocolate with a very different texture than a chocolate made from beans and butter from the same location or the same melting point. Sometimes this is a bad thing as the mixing process (an effect called eutectics) can lead to textures that are not desirable. So - if you are adding deodorized cocoa butter, take a close look at the hardness of the butter and try to find a match for the butter in the beans you're using.
Finally (for this post anyway), the vast majority of chocolate makers (small and large) do not press their own butter or use undeodorized cocoa butter, if they use butter at all. So, no, a butter press is not an absolutely necessary piece of equipment.
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@DiscoverChoc