Hi -I think Jaslan has it right. I downloaded the free version of Kontakt 5 and noticed a considerable difference in bass guitar sample quality. It only includes three bass sounds, but the upright bass, for example, has a nice “bump” sound compared to the electronic drone of the Sonic Se acoustic bass. It’s also much more distinct in the mix. I haven’t been able to do a good side-by-side comparison of the drum kits, but the Kontakt 5 drums likewise seem a little more defined and refined than the Sonic SE drums. Thanks again.