I just replaced my DSP board with the upgraded one, and I agree with the previous posters who said it improves the audio. That said, I found that, even with the latest firmware, my choices for the LO cut are 0.15, 0.25, 0.35, 0.45. I keep looking for the ideal setting for a given station and wish I could choose 0.20 or 0.30. 73, Erik K7TV