[...] and it always surprises me that even in these tutorials, there is talk like "this interval should have more like a small five beats per second, but in my ears it now sounds like a big four beats and not a small five beats per second etc."... waving with the hands... I am fed up with this type of subjectivities and I do really intend to put my trust for 99% in a tuning device. To state it differently, put ten tuners in one room, start talking about intervals, even on a really basic level, and one would immediately witness an endless discussion in which everyone is more or less right and wrong at the same time.