Donny,
ONLY the Keysoft Service brand HD-SX6 Hard Drive will work in the KN6000 because the KN6000 requires the specially designed HD-SX6 OS software for hard drive function and integration with the KN6000 operating system. The HD-SX6 allows you to easily create, store, and organize your hard drive song files (including lyrics/chord display if desired) directly from the KN6000's keyboard buttons and includes functions like file load script (storing/calling up song medleys - great for instantly calling up songs in succession for an entire show). I have the Keysoft Service model HD-AE5000 hard drive made specifically and installed on my KN5000 and find it indispensible, especially for live gigging. I have my complete collection of hundreds of customized songs/styles stored and organized by style type/category which offers instant (2-3 sec) song/style access/loading at a touch of a button. The hard drive may be pricey but I still think it is was WORTH EVERY PENNY I SPENT.
As far as the vocalizer goes, I don't think there is any other brand or model available which can be installed internallly to replace it. Instead of using the inferior one which comes with the KN6000, I recommend checking out the new "Voice Prism" vocal processor by Helicon. In fact, I'm even considering upgrading from my current "Digitech Vocalist Workstation EX" (which I still love) to this new improved "Voice Prism" unit myself. It's specs sound very impressive.
http://194.239.18.101/TC.asp?Section=7 Scott
