I have been looking into getting a preamp for a korg DAW. Some of the preamps I have looked at include: Focusrite red 8 dual mic preamp, mh441 isa 428, or isa 430 mkII. Avalon makes a dual mono ad2022, which I might also be interested in. I would be recording rock vocals, drums and guitars through this. My big problem is I can't hear any of these preamps before I buy them. Any recomendations would be greatly appreciated.