[mythtv-users] How does they "Y" key cycle through tuners?

[stuart]

How does they "Y" key cycle through tuners?

I'm confused.  After about a year of running an NTSC Hauppauge, ATSC 
Kworld 110 & ATSC Kworld 120, my Kworld 120 has given out.  (Whether 
this is because the driver broke during an update or bad hardware I do 
not know.)    To test the tuners I press "Y" to switch between the 3 to 
see which is working.  But I am sure the front ends are only switching 
between 2 different tuners (it is obvious the NTSC tuner shows up every 
other press of the "Y" key on the mythfrontend application regardless if 
mythfrontend is running on the MBE or the SBE machine).
Setup...
MBE: NTSC Happauge & ATSC Kworld 110
SBE: ATSC Kworld 120

Can anyone explain the logic behind watching live TV and the "Y" key?

BTW, I checked this last go around w/the "Y" key on the MBE to see if 
any of the tuners were being used.  All 3 were doing nothing according 
to the mythfrontend application running on the MBE.  Pressing "Y" on the 
MBE while trying to watch live TV cycled between the NTSC Happauge 
turner and an ATSC tuner that could not lock onto a signal. I was at 
least exptecting the Kworld 110 on the MBE to work.

Just plain frustrating.