So basically if you have say 10 months left of Xbox live on your subscription. When you sign up for the Ultimate with the $1 deal it converts that 10 months of regular Xbox live into Xbox Game Pass Ultimate. Which is Xbox live+Game Pass that's regularly 14.99 a month. If I would have found 12 months of Live on sale for say $40 and used that beforehand. I would have been able to convert that into 12 months of Ultimate for $41 essentially. Probably needs to be explained to everyone in the OP. So your 3 month card of XBL is worth 3 months of XBL ultimate for $1...
It combines your two subs.
Ie if you have 1 month of Gold and 1 month of Game Pass you'll get 2 months of Ultimate.
So in other words, if you wanted to take maximum advantage of it, you'd make it so you've got a combined total of 36 months between your subs before you swap to the Ultimate sub.
It will convert whatever existing Gold and Game Pass you have into Ultimate, then add them together. So if you have 3 months of Gold and 3 months GP, you'll instantly get 6 months of Ultimate access added to your account (It will cancel out your current Gold/GP as they're included in the Ultimate). Best bet is to load up as much as you can then take the trial, I purchased 2 additional years of Gold and added it to my 6 months GP + 1 month Gold I already had THEN took the trial/conversion up, my Ultimate is now not due to expire until 30/04/2022
Also: Remember that if you follow my example, deactivate any renewal you have on Gold atm, as you get an additional month for turning it on. Do this each time you add a code (Turn off, add code, accept renewal, repeat) and they stack.
Wow. Thanks guys.
Ill try it out now.