You should see Zarg/John Bowen's Pro-One. Just a few steps more in the grit direction (it allows for use of the Moog Ladder, CEM, SSM, or other LP/HP/BP filters). Beautiful.
(both were done by John Bowen actually)
And welcome to 5.1... (there's also the Arpeg01 and Arpeg02 devices included with 5.1)