Hi furtwaengler,
Thanks so much for listening again to these Catoire pieces in the complete sets. Caution: They become addictive!

There is that constant interplay between the tangible and the abstraction as you mention. I do believe that all of these pieces are about passion, both recalled and in the moment. Evidently Catoire was very complex.
Yes, although we hear the vocal textures of Wagner, the polyphony of early Scriabin and flashes of the later mysticism, and the shifting tonal centers of Faure, Tchaikovsky was certainly an influence as well. Catoire actually knew Tchaikovsky, and the latter was keenly interested in Catoire's early efforts at composing. Tchaikovsky introduced Catoire to P. Jurgenson, his own publisher, and also referred Catoire to Rimsky-Korsakov for more training in composition. So there was a definitely a friendship there. And who better than Tchaikovsky could write a tune? I'm sure that rubbed off on Catoire, which is why you hear that particular influence.
I too am frequently aware of that narrow pathway winding between impressionism and expressionism that Catoire so often treads and explores. To me that tangential divide probably feels like touching the very edge of the universe. Alban Berg was a contemporary of Catoire, but I do not know if Berg was ever aware of Catoire's music, for the very same reasons that nearly most of us have been unaware of it. Had Berg heard Catoire's works, I feel sure he would have loved them. Likewise, I think had Catoire been able to hear, for example, Berg's "Seven Early Songs" for soprano and orchestra, would have been taken by the expressionism.
Getting a rich sound from my Baldwin is a challenge. The piano, recorder, and microphones are all very good and up to the task. But the living room itself is a limitation, and with the furnishings and carpeting, I think it robs the piano of some of its "bloom". (Room recordings are seldom easy for anyone.) Yet sometimes I can attain that rich sound. The tuner has been most conservative in voicing the relatively new Ronsen Wurzen hammers, as he likes the vibrancy of the piano, as it counteracts the properties of the room I mention.
Thanks again for your interest in this music. I greatly appreciate it!