frankjcc
My vote will be double touch. this is the least strain and faster action.
As I have wrote, I do not like "double" actions. That is always "subjective" what is "double" and what it 2 sequential actions. Especially with touch. Example: "I think the resonance frequency is a bit lower..." (touching the control), "hmm" (releasing the control), "yes, just a little bit!" (touching the control, in your scenario the frequency is reset to default). Next thought will be not about the frequency, but about the person who has implemented that "feature"
What if we made use of touch combinations
2 general problems there:
1) you can use 2 hands to control 2 parameters at the same time. Examples: Freq/Gain, adjusting pan on several tracks (so your left hand is still touching left encoder for fast switching while right hand adjusting pan). I do not think you would like "side effects" there
2) I do not know how good touch is on Alphatrack, but during my short attempt to use Nocturn, I was "touching" near everything on my way to the control I was engaging. Display change - ok, but some changes inside Sonar...
I know I know this all seems so complicated and it probably is, but!! this is how Azslow introduced the AZ controller in the first place, he shouldn't have(just kidding) I'm loving it the way it is, And I sent flowers.
I do not say it is not possible! There is no special "double click" support, but everything enabled in Monitors is possible reaction. I just have arguments why I do not see it practical.
And in case you want some actions using touch without "upses", it is easy to add "F1+Left encoder touch" and so on. "Flip+Encoder touch" is already in use. Note there are already some side effects from touch. For example, when left encoder is touched in the strip changing mode, Fader motor is disabled (to avoid jumping during rapid track changes).
Flowers are "working" by doing nothing (no joke, since I have introduced that idea, my wife has not complained about me programming the plug-in... ). But in case your device will attempt to "work" based on the fact your hand is in the near, I do not think you will be happy.