I’ve practiced with the Tour Tempo tones and it’s important to note for those not familiar with it…
…the underlying principle is a 3:1 ratio of time of the backswing to time of the down swing and through swing…
But…
…the actual speed of each part may vary - and will for different golfers - so different sets of tones are provided for you to test your swing against and find your best fit.
There are also full swing tones vs short game and putting tones which are based on a 2:1 ratio.
Re: Orange Whip
The OW Trainer can help you develop your tempo but does not itself inherently teach tempo … you have to listen to the Tour Tempo tones or other cadence to sync your swing to get a proper rhythm.
(Hope I explained that ok?)
Re: counting on your head
I like to swing doing that … noting again that I’ve practiced in the past with the TT tones … and count off my own “onnnne … and … TWO” rhythm.