Bill,
re. the fill button: yes, it is true that the VA 7 has only one button, but it works this way: if you press it once it will play a fill and go from one mode to another (basic to advanced and viceversa), while if you press it twice it will play a fill and stay in the same mode (basic or advanced).
Greetings
Andrea
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.