Without going into a lot of tecnical lingo, the Tyros is probably the most versatile keyboard out there. Connected to a set of amps or the Yamaha YST MS50 speakers ( I use Velcro to attach the satilites to the Tyros) the Tyros sounds fantastic. The big band styles are especilly the best i've heard from any arranger. It's worth the extra money. Just my two cents. Bob