Googled jPlay and then read the blogs debating its worth. If you hear it, then you hear it, but there is a claim made by jPlay that is an impressive sounding straw man that attacks a problem that does not exist.
The argument is that Windows is not a real-time system, and jPlay modifies the behavior of Windows to make it approach real-time performance. I worked in real-time operating systems, and I understand the lingo and arguments that jPlay asserts, but a reasonably recent Windows laptop should be staggering overkill for delivering a quality, bit-perfect data stream to a DAC in a timely matter.
The human mind is susceptible to assertions presented as stories. JPlay has a nice one, but reality seems to differ. True, I haven't heard jPlay, but it seems to address a well-constructed problem that actually isn't.
At the point that jPlay claims to improve the data stream, you can quantify the difference. I could not find a single example of a documented difference. As a player it may be terrific, but some of their reasons for 'better' seem iffy.
