First post ever here!  Yay!  Go me.
 
I'm running Sonar Platinum on Win10\64.  Standard fare Sonar VST's.  I have several pieces of midi hardware I can't part with.  I also have a Moog Modular and Yamaha CS-80v plugins  And a couple of mics thrown in for good measure.  <- That was funny.
 
I have this happy TASCAM 16x08 device to bring all this stuff together, but am having a tough time getting Sonar to "work" consistently.  I'll have the whole rig up with all devices working (and playing) as advertised, then the next day, nothing. Zero.  No sound.  Just the keys on my controller squeaking.  Same everything.  I suspect the Tascam driver, but don't know the best way to troubleshoot it.  I know the sound engine is started, but where to look (besides Focusrite)?  I've done the uninstall/reinstall drill a couple of times.
 
Is there something that I should be looking at in Sonar?  I'm not changing any of the interface settings.  I'm not changing any anything.  One day up, next day down.  Just shoot me.
 
Appreciate any input!
 
Thanks
Ciao
Peace Out

I use this and it definitely works with SONAR.

First of all, make sure you're in ASIO mode for the driver model. WDM and WASAPI does work but it's flaky compared to ASIO with this interface. After you've selected it, close and re-open SONAR.

Then, make sure the correct I/O is selected in the inputs and outputs section. There should be ticks in the analog ins and outs.

Then, check the MIDI devices to make sure there's ticks in the 16x08 MIDI I/O.

I'm guessing you've done all of this first, but it's worth going over just for safety's sake.

Very important that the 16x08 is powered up before you start SONAR because the next time you start it, it'll default to whatever​ model it fell back on last time.

Have you got anything else running on your system that may be stealing audio focus? Some media players and, weirdly, some webcam drivers (eg: ones with audio related) can try to steal control of your audio driver.

Are you running the latest 2.x driver and firmware for the 16x08? That adds a few features and stability for some people (it was about the same for me).

Good post, LT!
 
Another situation that can cause trouble is if you also use the ASIO driver for Windows default sounds. I use the motherboard Realtek audio for Windows and the Tascam ASIO for tunez. I have tried the Mixing driver for Windows while using the ASIO driver for SONAR, but that was problematic. I will switch Windows default to the ASIO driver when I want higher quality audio for a short period, then switch back to the Realtek when done.
 
EDIT: It would be helpful if you put your system specs in the signature. That will save several questions and back and forths.

Thanks so much for the tips! 
 
There are definitely some things to look into.  Correct I/O is probably where I should start.  The driver is confusing though, in that Devices shows only odd numbered I/O's (oddly enough).  Analog in shows 1,3,5,7,9,11, and 13.  Output drivers are 1,3,5, and 7.  There are Mixing drivers as well, but they're grayed out.  In here, ASIO is the only option.  Right now is probably not the best time to come up with some "friendly names" for the drivers.  lol
 
let's see.. Latest Tascam firmware & drivers, check.  I am running a TP Link wireless Ethernet adapter on the USB hub.  I don't know that it's making much of a difference.  I've tried running without it.  I'm pretty sure the Windows sounds are also on the ASIO driver.  I don't use them for anything but an occasion Cakewalk video.
 
Thanks again for taking the time to help me sort things out. 
 
I'm guessing there is a place to set up a signature..
AMD FX-8350 8 cores, 4.01Ghz |  16GB RAM | 500Gb SSD system drive, 1TB data drive
Tascam 16x08 | Sonar Platinum | Arturia CS-80V, Moog Modular V | Peavey DPM-C8, Roland A-330 controllers
Dave Smith Prophet '08 | Dinosaurs: Roland TD-7 Drums, P-330 Piano, XV-3080, D-550 | Alesis NanoBass | Korg TR-Rack, Wavestation |

Yeah, don't use the Mixer drivers, they're high latency, plus as you saw, you can't select them if you have the regular analog input driver (just one channel of, even) selected.

I've done a friendly rename of mine and it helps a lot. The default names are annoying as hell.

If the 16x08 is the default system device, there's a good chance something else is stealing focus.

Try checking Share Drivers with other programs in SONAR's audio preferences - that will help.

But yeah, check I/O first, and then try the share settings and see how you go I'd say. :)

A few things, You mention a USB hub..  not a good idea. Always use the same USB port and not shared. 
I find I can use my Tascam us1641 which is probably identical, for all my audio so I always totally disable all other audio devices including HDMI audio in device manager. This solves the issue of loosing your driver in most cases. Some people get away with using both on board and the ASIO driver but if your having this issue best to do as I have done. 
 

Cactus Music
A few things, You mention a USB hub..  not a good idea. Always use the same USB port and not shared. 
I find I can use my Tascam us1641 which is probably identical, for all my audio so I always totally disable all other audio devices including HDMI audio in device manager. This solves the issue of loosing your driver in most cases. Some people get away with using both on board and the ASIO driver but if your having this issue best to do as I have done. 

I did that for awhile, but eventually went back and reenabled the MB Realtek device. There were too many times in the way I use my PC that multiple apps wanted/needed access to audio output at the same time, and ASIO isn't shareable unless the driver supports multi-client ASIO (like Steinberg's multi-client wrapper). Most aren't, and the mixing driver just isn't cutting it yet.
 
https://www.steinberg.net...opic.php?f=34&t=48

Grr.. Still not having fun. 
I'm not using a USB hub.  The wireless adapter is plugged into another port on the computer.  I checked the "share with other programs" checkbox.  That sounded like a good idea, but still no bueno.  The 16x08 is the system default device.  Soo, here's a possible clue.  On the track level meters for my midi devices, I get two green boxes at the very top of the meter when I hit a key.  I rebooted the computer.  Now I don't even get the green lights.  It's dead. 
Gotta say it's breathtakingly awesome when it works.  It's just random.  I'm at a loss.

Oh - One more thing.  If I open up a synth, like dropzone for instance, I can play the keys with the mouse.     :/

When you loose connection go into preferences and see what is selected as the audio device.
The Tascam should show but if there is another device and it is ticked that is your problem.