I used to use V-Control Pro with an iPad but I'm not happy with the paid version.  They promised a SONAR template for iPhone but never produced one, to my knowledge.  It is cumbersome to install, requires iLok, is not reliable, and is overpriced.
 
I have experimented with DAW Remote HD, but it hasn't been supported in years.  It will not support iOS 11 so I have to keep it on a very old iPad and cannot use my newer one.
 
All I want is transport control including one button for back to Home, track selection, and track mute/solo/arm for recording.  I like to play along with SONAR and occasionally record a track, and the room in which I do this is a different room from the computer.
 
Do you have any suggestions?

I tried a bunch of them.  I ended up using the free Splashtop, which is a remote desktop program that works via WiFi.  It basically makes your remote device into your DAW's screen, so you can do anything and everything you can do on your normal DAW's screen.  On portable devices, obviously the screen is very small, but you can zoom in on any portion of the screen you need to, for instance a portion of the control bar, or a portion of the track view for the purposes you mention.
 
I've never had an issue recording that way (using iPad/Splashtop wirelessly connected to DAW).  Works great.
 
https://www.splashtop.com/personal
 
Pete

I am still able to use DAW Remote HD on an iPad2, with less upgrade anxiety (at least from the app/Apple end)  -  
(older iPad is also still useful for storing midi sysex patches, manuals, many other uses). 
Another option might be an older Tranzport unit, as far as I know the drivers still work on Windows 10, and they seem to be available on eBay from time to time.
 

riojazz
...
I have experimented with DAW Remote HD, but it hasn't been supported in years.  It will not support iOS 11 so I have to keep it on a very old iPad and cannot use my newer one.
 
All I want is transport control including one button for back to Home, track selection, and track mute/solo/arm for recording.  I like to play along with SONAR and occasionally record a track, and the room in which I do this is a different room from the computer.
...

Thank you both.  It's been a long time since I looked at Splashtop; will look again.
 
Steve, yes, I have an iPad2 and it is frozen as far as updates, so I'm still OK using DAW Remote HD.  But the way the Apple store works, insisting vendors keep up, makes me wonder how much longer it will work when this vendor does no support.
 
Any other suggestions out there, please?

I use TouchOSC, but on my iPhone. I would think it would translate to an iPad. This is with azslow’s
azcontroller. It can be very simple or much more comprehensive. I use a simple setup that allows choosing a track, MSR buttons and most important ‘undo. ‘

In my researching for Splashtop I also found VNC Viewer, which also has very good reviews. Has anyone tried that one?
It's free, allows access from anywhere in the world, but forces you to sign up with their server.

I had not used Splashtop since 2012.  I reinstalled it and it works fine.  The iPad screen does have to be zoomed somewhat, but it does what I need.  Thank you, Pete.

Splashtop Personal - WOW!  Holy Cow!  It works!
I just bought the iOS app ($9.99) and installed it on my iPad2
and installed the other part on the studio computer.
It all went without a hitch.
 
So now I have all of Sonar's program on my iPad.
Where have I been?  This is incredible!

I'm glad you guys find Splashtop useful!

I don't have an acoustically good recording space, so I do critical recordings in a walk-in closet full of clothes (the quietest "room" in the house), which is very dry and allows me to avoid the not-the-greatest acoustics in my studio. Obviously I can't bring the DAW (laptop) into those close quarters due to fan noise. So the iPad with Splashtop works perfectly. Plus for some things (like sampling), it allows me to see the realtime peak and short term signal level graphs that are on my DAW's screen (MMultiAnalyzer). Quite handy when recording velocity layers. You can't do that with any of the remote control apps.

stevethompson
Another option might be an older Tranzport unit, as far as I know the drivers still work on Windows 10, and they seem to be available on eBay from time to time.
 

 
FWIW, I have a Tranzport and it works just fine on W10, Splat.