I respect your point if veiw David and I am prepared to accept critsism of my playing ,providing it is constructive and being a self taught concertina player, I am my worse critic. I do however disagree with your excuse for not joining in.Henk recorded his music using a metronome and then edited it out afterwards.I thought Henk was being the perfectionist he is and surely, I thought, he was going a bit over the top, but obviously not.Knowing you David I would not expect you to walk away from a session, or not join in with somebodys playing, because the speed varied.I cannot remember a session or even a recording session where the speed did not vary a bit.
Henk and I are just trying to create a bit of fun and in my preamble, I did say that these were trial recordings and the original master recording could be rejected if necessary.
The other point raised was one of large numbers of concertina players playing together ,this is of course the major aim to get as many people to join in as possible and give them the opportunity to practice what we hope at some future stage they may do in a recording studio.We also made clear that this was not just for concertinas but for any instrument, indeed we even had a promise of a musical fence post.
I can understand many people not joining in due to time,work,computer technical problems etc but not for the excuses you mention David,but it is your choice.
All this being said I am not cross, annoyed or unhappy ,I do however think that the amount of time and effort Henk put into this idea some of you at least would give it a try.