I asked for advice here re: VMC 32bit and tuners. Was told that VMC did not play well with the combination of analog and digital tuners and I should expect spotty or mixed results.
I persevered and with the help of a program called MCE Tuner Extender, ( I think) was able to get my new Avermedia Duet to work with for OTA and my old WinPVR950 to receive analog cable. This worked for a month or so and then, about the time of the Digital Transition, I lost the analog tuner and have been unable to get it back.
Love the Duet. Good signal catcher, good picture and quicker than the WinPVR950 on the channel change.
I believe that MCE Tuner Extender may be helpful in getting more that 2 tuners to work but, my guess is that you'll have better luck staying all digital.(or all analog?)