I've not owned an SD7 but on my previous SD40, the Registration seems don't remember the Voicetron to Arrange settings. AJ advised me to create first a user's setting of Voicetron and save it under a registration, I did but I have'nt able to make it work. Maybe the next O.S. will address this.
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Jim

SD90,Korg I3, KMA Liverpool,TC Helicon Play Electric, Fender Sonoran Guitar, vArranger, Bose S1 Pros, Bose L1 Compact, Aiwa Exos-9