Despite my sig, I have no need for an undo button or Ctrl-Z, because I never make a mistake.

@WVought - lol
 
@Vladasyn - I frankly think they should put it back just for you!
 
I also see this as an opportunity for Control Bar Customization. Touch will increase our desire to be able to customize our on-screen functions to our special needs. While VLadasyn might need Undo, I might need a single touch to bounce to tracks or normalize or some other thing. If we could create customized Control Bar sections, it would make adopting touch more comfortable.
 
For me, part of the issue with adopting touch is it takes practice. Over the years, I've become very efficient with mouse and keyboard. It is hard to rival that efficiency as a touch newbie. Anything that can be done to make it easier to bring up our touch efficiency will be helpful.
 
Right now, for me, I go from playing my guitar to touch the screen first to try to change what I need (tempo, time position, record arm, levels of various tracks); I can do this without putting down my guitar. If I have to put down my guitar, I'm likely to just make all necessary changes with keyboard and mouse before picking the guitar back up.

The buttons were taken out at the time (in X1) to redo the control bar and remove excess clutter. At the time it was determined that most users do not use those buttons but use shortcut keys.
One thing that confuses me - if you are at a MIDI keyboard how would you have access to control the mouse anyway even if there were buttons? So I don't see how buttons would solve the problem you stated. 
If you are at a MIDI keyboard exclusively, you are much better off assigning MIDI key bindings with a MIDI shift key to assign a 2 keys for undo/redo, as someone else pointed out in this thread. 
 
That said I think with touch screens its not an unreasonable request to want buttons for undo/redo ...

Noel, I totally agree with you on the excess clutter thing. I think 98% of us will never hit the undo button on the control bar.
 
That said, being able to customize touchable buttons on the screen might make a real difference.

An undo button and others in the control bar is a great idea.  I think X3 is great, but this is definitely a great enhancement idea for those that use these buttons on so many programs including 8.5.3, etc.

Where is the features request thread? I thought- all we have to do is- post on the forum. I have been asking for it on and off for couple of years- nothing happened. I am hoping every new update, every new paid upgrade that it will re-appear, but it is not. I did not hear that Sonar can be controlled with iPad or Surface. It is interesting. What I did is- I made 4 monitors set up. I have 2 monitors on my desk and monitors on keyboard station, this way- I can see screen when recording. But Undo takes 3 steps, when it is 1 step in most of the programs.  

When I'm tracking my drums, I use my Ipad running Daw Remote HD to control Sonar. It has a dedicated Undo button on it (which I use regularly), so I am going to make the assumption that it is possible to map it to a button on a midi controller.
 
When I'm at my keyboard, I use ctrl+z

vladasyn
Where is the features request thread?

Link to feature request form in here http://forum.cakewalk.com/FindPost/2839291

Noel, I never in my life in any other program used Keyboard Shortcuts. There is totally different workflow. Many people do everything with mouse. I do not do "Control A, Control C, Control V" in word- I use mouse. Wireless mouse is small and fits on any keyboard just fine. One problem with it is that it falls down when you play. Now- carrying keyboard AND mouse AND mouse pad every time is difficult. I had to place monitor on the keyboard to be able to press "Play", "Record" and such. Yes, I know- I can press the bar on keyboard to start playback. But I would not know how to engage Record or select a track- one way or another- the monitor is needed to be able to see the wav clip appearance, pics and so on. While I can see how Normalize button may be nice, nobody uses Normalize continuously over and over and over. Undo- when I record a phrase- I some time make 50 takes. I would play the same thing over and over and over and over until every note is in place. The I record filters Cutof/Reso/Modulation, and such. Those take multiple takes to get it right. So if I do 50 takes, with 1 step Undo, it is 50 clicks. With 3 steps undo- it is 150 clicks. That hurts. How can you say that Undo is a clutter? I did not get full understanding of this new feature that makes little takes within the track. This may be helpful, but I do not need to collect bad takes. When it is bad, I know- I want it to be gone, therefore- UNDO. 150 clicks is frustrating. Other than play- can you name one function that is used that many times?

I see what you mean about having a wireless mouse. However I still encourage you to try using MIDI keybindings since its far better than messing with the mouse.  These don't require a computer keyboard. All you do is assign a convenient MIDI key to do any action you want. You can have one action for undo and another for redo. So record a take, if you dont like it simply press the assign MIDI key on your keyboard and you are done.
We used to do that in our studio all the time since the keyboard was far away from the computer and even the screen was not visible. Using some simple keybindings it was easy to start, stop, record, undo, redo and save all from the MIDI keyboard without even looking at the screen.