Hi All, I currently use "E-MU 1820M" as my preamp, and I am thinking about getting the "ART Pro Channel" preamp and compressor. Is there a real differance between the two preamps? Is it a real "upgrade" or will I recieve the same results? It will be nice if you can recomand me of a single channel preamp and compressor, that cost around 300-350$ that is better than the ART pro channel. I usually record female vocals and acustic/electric guitars. Thanks.