Hi Deane,
You will love the light weight combination of the 10-lb Roland A800 Pro 61-key controller and the 8-lb Ketron SD90 Pro Live Module. Using the Ketron SD90 module is much more convenient and easier than using vArranger with a laptop.
The sounds and styles of the SD90 is definitely a step above the vArranger plus Ketron SD1000.
The only issue I have found so far is a stuck Right voice once in a while with my old Yamaha S80 synth as the MIDI controller. I will have to test the SD90 module with a newer MIDI controller to see if the stuck note is a defect of the SD90 or not, or just caused by the MIDI controller itself.
Thanks,
Paul
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Yamaha Genos, Ketron SD90, Korg Kronos 2 88, Korg PA1000, Casio Privia PX560