I use Lemur on an android tablet though it is native to ios. There is a template for Sonar and it works a treat.

Actually just saw that Splashtop personal was on sale for $2.99 in the App Store.

Along this line of thinking, Are there any apps available for controlling RME's Total Mix?
 
I don't have a pad yet, but likely jumping in soon

Regarding Splashtop, my desktop computer does not have wireless. Is it a correct assumption I couldn't make this work?

You would have to connect your computer to a router.
 
I have the original Tranzport as well and it works perfectly with S Plat.

I just installed and configured EyoControl. Even though the software states it supports up to iOS 7 it’s working great on my iPad which is at iOS 11.3.1. I’m primarily just interested in transport, panning, record, solo, mute and fader control. All of those work great for me via EyoControl.

I still use AC-7 Core HD. Has a Sonar mode that is still compatible with CbB and then I simply use RTMP midi to set up the connection from Ipad to LAN and into the PC. Once in sonar it shows up as a Mackie Compatible controller and had all the Pans, Fader, Meter, Transport / Jog Shuttle that I need. Works a treat and has done so for many years.
 
Another option is DAW Remote HD which works in a similar fashion but also allows you to build custom panels.

Is the more to the name AC-7 Core HD?  It doesn't show up when I search the app store
 

I gave several apps a go and it was all just too difficult and unreliable. I have two identical wireless keyboards and one lives in the recording booth. I was thinking of putting an extra screen in there too, but so far, it just hasn't been necessary. I usually loop record if it's just me in there and the extra keyboard works a treat !!

Sixfinger
Is the more to the name AC-7 Core HD?  It doesn't show up when I search the app store
 

They changed the name to AC-X. I couldn’t determine if the new version is Windows compatible. I sent support a couple days ago but didn’t get a response yet.