I don’t know, my friend. Download the Eb DropTune Preset at the link below. Import the Preset into H90 Control. It is pretty much what I described above. If that doesn’t do it for you, then maybe the H90 / pitch shifting algorithms just aren’t for you.
https://www.dropbox.com/s/p7lh30dd40e5joy/Eb%20DropTune.pgm90?dl=0
So what’s wrong with Billy Cobham’s Stratus? I love that tune, and the sounds in it! Right up there with Quadrant 4, and the EchoPlex mangling. For the Jan Hammer / Tommy Bolin lines, I’d use the HotSawz algorithm. Although … Jeff Beck’s live version with Tal & Vinnie gives the original a real run for its money.
Seriously, I hope this works out for you. I added a few bells & whistles to the Preset that you don’t have to worry about now. Expression pedal & Performance Switch stuff; it’s all in the Program Notes for later on. The main thing is that Preset A has the Eb drop tuning, and you can make it active or bypass it with either the [P] switch or [A] switch. The (B) switch does nothing (THRU algorithm).