VPI Analogue Drive System

Doesn't my SDS that drives my turntable do what the ADS does??  What's the difference - is one better than the other, etc.

How about the Music Hall Cruise Control? Worked great with my old VPI HW 19. 

stringreen, Having compared the SDS to the ADS with a friends Classic 3 signature. One thing the ADA absolutely did was wipe out noise that I didn't really notice until we switched it in. It's an immediate  and noticeable improvement with his table. He purchased it on that alone, not sure what the sonic improvements are, I'll ask now that he has had more time to compare the two units.  

Thanks tom....  I just listened again to mine, and find it dead silent....I guess I have to get one to test out in my system

Tom:  eagerly awaiting your report re sonic improvements with ADS unit.  This was my original question.