Product simple and easily portable. The sound is okay and very small breath. lattence time is not too large (a few milliseconds) but may be more troublesome for real musicians (who will turn to more efficient products). The installation did not pose much problem on win8.1: take this product as a sound card -> So when it removed and you launch the software: there's feedback! (And / or change in paramettres Asio4All). Software must be taken preferably on the net.