When I look under the FAQ's it says that all keys work perfectly together which contradicts the thing I read yesterday. NOw I'm interested again in it. They also say that the TF1 adjusts every string to fret contact point so that the freq plays exactly at each fret, and they claim perfect intonation too. Apparently this TF1 is their end all be all height of their accomplishments with this so they stopped using the other methods. I get he misleading/ not transparent parts of how they choose words but basically it seems if you read everything they talk about under the preface of realting to their well tempered TF1 technology then it is "technically" all true. The last claim on their FAQ's says that it works just fine with "ordinary" instruments and causes no dissonance whatsoever. I don't buy that because if it didn't then what dissonance is it eliminating in relation to "ordinary"? It can't be different and the same. I think they mean that it sounds good together still, but that seems debateable.