For the first time today I connected vA2 to the Ketron SD4. I don't know how the Sd4 compares with the SD1000 in sound quality, but I thought the SD4 sounded great. It is as if my SD4 sound module took on new life as an arranger playing different style formats all thanks to the smart vArranger2.
I use a usb midi device that can be connected to four foot pedals for sustain, pitch bend, and the like, but I have to use MIDI-OX to merge the incoming midi. I hope Dan will implement midi merge in the next update.