I've been using the NDH-30's for the last year and can say they are a solid neutral headphone for mixing. Not as "fun" as some other offerings but...
All they did was port their existing Kemper packs to tone-hub format and are using a similar but different capture method to add new packs....
The problem is likely you only have 1 rhythm guitar part recorded and by just duplicating it and panning the same part L and R it will sounds...
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