I bought the Ketron SD 1000 a short time ago. Assuming that a lot of its samples are similar or equal to those of the Audya, I agree to the point made about the number of velocity layers (samples per velocity range 0-127). I think a lot of samples are excellent for a certain velocity, e.g. some of the trumpets are better than any of my Roland Integra and Yamaha Motif XF trumpets, but indeed they are often not very dynamic, they tend not to have separate piano and forte samples.