Hi Heyoop and all,
Sorry: I can't compare to the session board, as I don't have it.
However, I've got the VE-RD1 installed in my A90, and I really like it.
But a bit of a warning: the VE-RD1 has alot more capability than the rather poor (IMHO) presets suggest. It takes a bit of tweaking to get it sounding decent.
My impression is that Roland didn't spend too much effort on putting the performance presets together. For example, there are 3 or 4 wurlies on the board, sampled at different velocity levels. It's rather easy (but time-consuming) to create a performance where different velocity values cause corresponding samples to sound: Roland didn't do this.
Still, a cool board.
Chris