I am pretty sensitive to tuning problems, since one of my day jobs is piano tuning. It's really annoying to play an organ that is badly out of tune. No one can make much music on an organ or a piano that is noticeably out of tune.
A couple of observations: (1) I sometimes play a pipe organ and thoroughly enjoy it, only to become aware afterwards that it was somewhat out of tune or that it had several sour notes. I think our ears/brains can overlook a lot of tuning imperfection when the instrument is otherwise making good sounds and we are a bit "lost" in the overall effect of it. Even guys like me who take pride in a good sense of pitch can be sometimes oblivious to tuning, if it's not too bad.
(2) Electronic organs, particularly the latest digitals that use true sampling, with a separate fairly long sample for each stop, can exhibit about the same amount of randomness in tuning among the ranks as a pipe organ. However, this may or may not be a good thing. Since the individual ranks of a digital organ are almost never assigned to completely separate speaker systems (except on perhaps hugely expensive custom digital organs that no one can afford or have room for), there are bound to be ranks sounding through any given speaker that are a little out of tune with each other. When a note is sounded that calls on ranks that are not "dead on" in tune, there are obvious electronic "beats" introduced that can sound a little like cats yowling and sceaming in the alley at night. Of course these beats are not always prominent and not always objectionable, but they can be much more distracting than the same amount of beating that would occur "in the air" with two pipe ranks slightly de-tuned, or electronic stops speaking from two separate speakers.
So, in some cases with digital organs, simpler can in fact be better. The old Allen MDS organs and the earlier ADC organs had the tuning locked "dead on" for all the stops in a given audio channel. Beating could occur only between channels. To my ears that was a little more pleasant than some of the over-done intentional out-of-tune beating in the latest digital organs.
This is only a minor complaint, though, and overall I think the sound of the latest digitals is still astounding and preferable to any earlier electronics.
John
Rodgers 890 at church.
Baldwin D422 at home.
Scads of old organs in the shop! H E L P !!!