Thank you, Alain. In fact, I'm off the pitch here and there, but more like "a wobble effect", and I actually like that. Playing the soprano is like those analog synths with hard-to-control portamento
Or like a swarm of fiddlers on unison folk melodies, another sound I like. Or Jimmy Page's dual unison guitar solo on Celebration Day from Led Zeppelin III. Another musician that uses unison arranging with a bit of pitch drift is Bo Hansson, one of my absolute favorites. He had a big success in the sventies with the album about J.R. Tolkien's trilogy books. He used a Moog for what I'm using the sax for. Oh, must mention Joe Zawinol too, a lovely melody magician! https://www.youtube.com/watch?v=rs0AmruS8Ro&list=PL9DD02F58FF7C27A8