Danny,

It sounds fine. Problem is if you own an XV5080 and played the BK9 side by side, you'd hear the audio quality differences.

Roland, Yamaha, and Korg often take sounds from their top gear, resample them at lower bandwidths, put them into a cheaper design, then run it all through mediocre converters to save costs. It gives the guy who can only spend $1k a similar sound to the guy who spent $3k on his synth. Usually minus bells and whistles and at a significant sacrifice in audio quality.