If you have a programmable mouse with a spare button.....
I have a trackball with the spare button set for undo

I have no need for an Undo button... or Save, or Open or any of the other standard Windows commands.   However, I am completely on board with a customizable Control Bar module that could house whichever commands you choose.   First step custom colored tracks, next step custom Control Bar module...   

Agreed, they should follow suit of how MS office does it's quick access toolbar.  Totally customizable very flexible, if you don't need it remove it or place ones you want.

How do you use "Control Z" if you at your keyboard, meaning synthesizer- the instrument with the keys? Unless it sits on your desk, I don't see how you can do the control Z. I have many keyboards in different locations. I am not always on one keyboard. I use plug ins, which have assignable keys specific for soft synth to change the samples. A key for undo would be hard to maintain when more than one keyboard controller is used. This should not be a problem- what was the reason it was removed? I feel like Sonar is oriented more toward the Desktop musicians who stay at their desk and have their typing keyboard in front of them. Or have sound guy recording live musician playing. When you play music instruments and record yourself, you are usually away from the desk, and dragging typing keyboard with you every time is not convenient. Where do you put the typing keyboard when you playing on Yamaha Motif 88 keys? I have to get up and walk back to my desk. And while I do stop recording to undo previously recorded clip with vocals, I still wear headphones on my ears and opening keyboard from under the desk makes lots of noise when using condenser microphone. I would program mouse- I do have a button on it, but I would not know how. I am sure, many people would benefit from simple Undo/Redo button where it used to be- it should not be that hard to implement.

I use a bluetooth keyboard if away from the desk, but my keyboard sits to the right side of my PC desk, so no probs. You must have your piano a long way away from the DAW then!
 
I can see an undo button would be nice, but I would hardly call it critical for 80% (my figures) of DAW users tbh.

For myself, I don't see having a clickable button for undo as much of a problem. Control-Z works just fine. It's not a desktop issue, because if you have access to a mouse, you usually have access to your qwerty keyboard as well. As for remoteing 'undo' via a midi controller, it's not an issue that is specific to Sonar, you'd have to manually assign a controller key to the 'undo' function in any DAW you might use.
 
I would think that in most cases for most people, the likely usage of undo is where you are seated at the desktop computer in front of your computer keyboard. This is where heavy editing happens. Somethings can via done via controller, but far more cannot.

We'll have to wait for panup to update Duckbar so we can have all these extra functions again.

I agree with this wholeheartedly!! I miss clearly laid out, customizable buttons/toolbars, etc. I really hate keyboard shortcuts. 

Lance Riley [Cakewalk]
If your keyboard sends midi you can probably set it up as a control surface. Using a couple of the buttons on the keyboard you could assign them as Undo and Redo.

 
Yeah. Or even (if the keyboard hasn't got any buttons and/or knobs) it's easy to setup MIDI shortcuts for the actual piano keys on the keyboard.
 
vladasyn:
You'll find this function in the keyboard shortcut window.
 
Just change "type of keys" at the top left to MIDI (and make sure Enabled is ticked)
After this it's just for you to start connecting keys to commands.
 
To execute the commands you need to hold down what's called the Midi 'shift' key. This is to prevent you from executing commands when you're actually trying to play something. You set the shift key up to the right in that same window. Select a note you seldom play (far up or down the keyboard) to avoid executing commands when playing chords.
 
By doing this you can control everything with the piano keys and you won't even have to reach the mouse.

I am so used to CTRL + Z that it is second nature to me.  I keep the computer keyboard on my lap while tracking keyboard parts, and it is a super easy reach to hit CTRL + Z if I screw up on tracking a clip.  No mouse, no fuss.
 
It's nice that there are multiple choices - THANKS Loptec - you posted a nice idea too.
 
Bob Bone