button to switch decks and reverses the crossfader

Hi,

I've got a Kontrol Z2 and traktor pro 2, with 2 turntables and timecodes.

I would like to use only one turntable to control the 2 virtual decks alternately, because I realize that I never operate both decks at the same time, so it could save me space.

Also I enjoy scratching a little, but I'm only comfortable scratching on one side at the moment, and I have to admit that I'm lazy to learn the other side. So I think to myself that I could possibly scratch on the same side for both virtual decks without it bothering me, since, theorycally, I never touch both decks at the same time. I really do believe it could be a good idea, and the only thing that could be annoying but which I don't see how to do without: using a button to switch from one deck to another. This button should also reverse the crossfader: when I actually scratch and use one hand to manipulate the cross fader, the crossfader must be placed to cut on the same side as the hand for a question of practical: for example I use my right hand to manipulate the crossfader, and therefore I would like the crossfader to mute the deck on his right position, whathever deck A or deck B is controlled.

Could you please explain me how to program this button? I would like it to be one of the Kontrol Z2 mixer buttons, but they all already have a function and I have difficulty choosing. Which button would you recommend to use for this purpose on my mixer? Otherwise, at worst, I could use a keyboard key or another USB device, but the best thing would be to be able to do it from the mixer. There is already a button to switch the crossfader on my Z2 : it is not very big and practical, but I wonder if it might be a good idea to use that one just by adding the decks switching function. What do you think ? Thank you for your advice.

Let talk about beat juggling technique now :

When using 2 turntables this is how it happends :

• rewind left deck, when crossfader is on the right position to mute this left deck
• release it and push to crossfader from right to left at the same time (to mute right deck and unmute left deck)
• rewind right deck
• release it and push to crossfader from left to righ at the same time

If I could use the "one turntable trick" to control both decks alternatively, this is actually how it's going to happend :

• rewind the turntable controlling left deck, when crossfader is on the right position to mute this left deck
• release it, and push the switching decks/reverse crossfader button at the same time
• rewind the turntable controlling right deck
• release it, and push the switching decks/reverse crossfader button at the same time
• crossfader will finally always remain at the same position (right). So : instead of pushing the crossfader from one side to another everytime I need deck switching, I only have to push one button. That let me think it could not be annoying to do beat juggling using only one turntable, and I event wonder if it could be more practical...