I wish I had an organ and start to working on it. I suppose, i am too old and to slow to learn the the organ.
No, can't be that you are too old - I play the organ since less than a year, and I am 44 years old. Too slow learning - that's a problem I have too. But I know it could go faster if I only would have a better practise discipline.
(I don't know what your problem is, always complaining you learn so slowly...)
First, many thanks for your detailed comments! Of course it is nice to get KIND comments, but it is soooo much more helpful to get comments which are of tangible benefit - and that is always the case if you give comments!
The thing is, in the time I record 3 items you record 15 or more pieces. For an Orgelbüchlein piece I need about 4 weeks to have it ready for a middling recording. Really not just fast - but the organ playing time is shared with the main time for piano playing and here and there guitar playing and singing too. But whom I tell - beside your organ and piano solo playing you play chamber music as well, church service, choir accompaignement, record pieces within unbelievable short distances. Not to mention the administration time for this site!
The 'O Mensch' is a little to breezy to my taste (but then mine is probably too slow and weepy). I don't agree with your choice for the upper register, I think it's a bit too sharp and cheerful for this piece, and also I am not convinced about how your adagissimo quite suddenly kicks in instead of growing from a natural rallentando.
Regarding too breezy I agree partly. It is strange - almost always it is so if I listen back to own recordings they sound faster as I feel while playing. However, I have a recording from Albert Schweitzer, he plays it still way faster. But I agree so far that already the title and the lyrics don't have something breezy at all. So a bit slower would fit maybe better.
Now, the upper register. Yes, it is a bit too sharp to me too. I don't have much degree of freedom on flute pipes (other registers don't work so well on this piece I think). Indeed, I always play the piece with two different register sets. The other set has only one single 8 feet flute register per manual. It sounds not bad either, but very soft. Gives it an intime character, but I accociate it as funeral sound. But isn't it funeral music, or suitable for that? I recorded it too, and could post here but has a key slip mistake what bothers me so I prefered the other one for this site.
Did you recognize the tremulant for the right hand voice (on "O Mensch")? Sounds decent enough for me, maybe works for other 2 manual pieces from Orgelbüchlein too, but adds a bit living breath. On the few organs I played, this one has the only tremulant what I find useful - not too deep.
The adagissimo - I simply played as written - no ritardando, instead adagissimo. One reason is that there is such a beautiful strange surprisingly coming harmony before the last bar starts, what makes sense to me to relish longer. But I agree, a ritardando is another good choice too.
Thank you all for taking time to listen and comment!