I've been using Sonar with WASAPI so a Windows screen capture program could capture the audio without the usual nasty Windows latency, and I could run Vegas at the same time. So far no problems, but last night Sonar simply refused to recognize my MIDI keyboard controller. Other programs could when using ASIO. After tearing my hair out for a while, I switched from MME MIDI to UWP MIDI, and now it seems to work. But I'd never had it on UWP before, so I'm not sure if that's the issue. 
 
Does anyone have a definitive protocol for using MIDI with WASAPI low-latency mode?

Thats weird. WASAPI doesnt have anything to do with MME MIDI so it shouldn't impact anything. Did you try switching SONAR to ASIO and did it make a difference?
I have seen some drivers get broken internally in one driver mode but work in another a long time ago. A reboot would fix it when that happened.

More WASAPI woes...

Noel Borthwick [Cakewalk]
Thats weird. WASAPI doesnt have anything to do with MME MIDI so it shouldn't impact anything. Did you try switching SONAR to ASIO and did it make a difference?

 
Thanks Noel! Yes, it worked fine with ASIO. The problem is I can't use ASIO because the screen capture will grab audio too only using native Windows audio. What's weird is that everything worked fine when I saved the project and then shut down. When I opened the next day...problems. 
 
Windows did an update when I turned the computer on. I thought that might be the problem, so I reinstalled Sonar. I haven't installed CbB on my main computer yet, only the Studio B one, so I'll try that.
 

I have seen some drivers get broken internally in one driver mode but work in another a long time ago. A reboot would fix it when that happened.

 
I rebooted several times to no avail. I'll see what happens tonight and report back. Maybe it was a combination of Windows update and something else.
 

I would try asio4all. Works better for me when I'm sans audio interface and has better RTL. 
It got a bad rap in the past but like all software is always being updated and bugs fixed. 
Things like it taking over your real ASIO driver don't happen for me. Might still be true for some ASIO drivers but not for Tascam or Focusrite. 
I was using asio4all for months and I brought that laptop home and installed my Focusrite driver and I can use either one. If I boot Sonar with the interface on Sonar uses that driver. If the interface is off it uses the asio4all driver. 
I later out of curiosity installed my Tascam driver and that also caused no issues. 

Perhaps you know it already but in case you don't, there's a great software Voicemeeter from vb-audio.com, check it out it might be helpful in your case. I remember using it in winXP and it was doing wonders.

chris.r
Perhaps you know it already but in case you don't, there's a great software Voicemeeter from vb-audio.com, check it out it might be helpful in your case. I remember using it in winXP and it was doing wonders.

 
Thanks for the tip, I'm not sure how useful it would be without recording the video at the same time so the sound and video are synched. But I can think of other uses.
 
To follow up, MIDI worked just fine last night without having to do anything other than turn the system on. I'm going to chalk it up to Windows update settling in, because that was the only difference between turning the computer off an turning it back on again
 
Thanks again Noel. It still may have something to do with MME vs UWP MIDI but all I know is that it's working, and that's all that matters!

I've seen MME go belly up on occasion so the reboot fixing it seems "logical"

Noel Borthwick [Cakewalk]
I've seen MME go belly up on occasion so the reboot fixing it seems "logical"

 
Only thing is I rebooted multiple times when it stopped working. Then again by using UWP in the Playback and Recording section of the MIDI preferences, maybe that bypassed any tendency for MME to be problematic.

I also record videos using Sonar and I was using Voxengo's recorder to send audio to another audio driver, so it could be captured. I think an internal Sonar solution would be a great addition. Either a plugin or something on the master that let you split the output and have part of it go to another audio driver. If it were easier to make videos I think more people would use Cakewalk, especially now that its free.