Karl!
How fascinating that I saw the notes G#-A-Bb in the opening of your work: in the 1970's I had a piano work which, in the Adagio, used them as a cluster (resolving to the A in the middle): the theme was a series of similar 3-note clusters, always resolving to the middle note.
But G#-A-Bb were the centerpiece.
Tomorrow I will listen to your work: I only was able to skim through the opening pages today.
I have been able to listen to your work today, but only down to the clarinet cadenza at Bar 83.
"Piquant" is the word which kept coming to mind to describe what I was hearing, not to mention mysterious and occasionally melancholy.
Besides the dialogue between clarinet and harpsichord, of great interest was the
Piu Mosso section at Bar 59. It contained a triplet figure, where the triplet leads to a longer note on the middle tone of the triplet, used subtly here and there, and - for me at least - an echo of
Mahler's opening movement for his
Seventh Symphony and of various sections of
Wagner.

I was interrupted, twice, so I hope to start over and listen later to the entire work!