No sound while playback

Hi. Do you use Simple Instrument Track, or separate MIDI and Audio tracks? If you only have a MIDI track, you will need to route your MIDI track to a soft synth / instrument.
https://www.cakewalk.com/Documentation?product=SONAR&language=3&help=Troubleshooting.18.html
Hope it helps.
All the best.

Welcome to the forum.
What is the output of the MIDI track set to?

A lot of us here value our email security, im sure you can understand that. we are a peer to peer forum helping others solve their problems. so...
My advise is to upload the photo to a free photo site and post the link here with a space between the Https photo. com.
because you don't have more than 25 post you can not post links (for spam security).
post the link and I will take a look at it.
 
Also- open:
-Preferences > Devices: under audio devices, make sure your Tascam is selected (check the boxes)
-Preferences > Midi Devices: make sure your devices are selected (again check the boxes)
-Inset a soft synth using the Insert menu on Sonars menu bar.
-when your "Insert synth properties" menu opens (a pop up box) select Simple instrument track.
(this is just to get yourself started)
 
This will route your midi track to the synth - then via the master bus.
It helps when you are thorough in your explanations when trying to problem solve.
you didn't even mention how you inserted the midi track / your synth.
sometimes this is the problem itself.
 

I restarted PC and now I can see again the piano under "devices"!
 
https: //s17.postimg.org/ketjayzm7/image.jpg
 
If it helps anyhow...

double post
 

okay now we are getting somewhere.
what you have here is a Midi track, that yes you recorded (we can see the midi notes)
but what is that Midi data feeding ?
 
It appears by the photo, its feeding nothing.
so I need to ask, what is your task ? are you trying to record the sounds from the Clavinova, or the sounds from sonar ?
 
Midi data alone can not make any sounds. this midi data must feed an instrument, a soft synth, exc.
 
That tab at the top that says: Custom
https://s22.postimg.org/8xlb9sjoh/image.jpg
Change that to: All
Then use the insert tab up the very top.
insert> VST Synth>Cakewalk>True piano
 
once you insert this piano, go back to your Midi track you created and send the output of that Midi track to: True Piano.
This will route your Midi track to the Synth.
 
This is important: What model is your Clavinova ?
I need to look up some specs on it to find out what it can do.
im literally blind here trying to make guesses.

then try using SI Strings.
We are trying to problem solve so it doesn't matter the VST.
 
your USB connection is for Data Transfer (midi messages) if you want to send the sounds of your device (Clav) to Sonar your going to need a Audio Cable.
 
What you can do however is use the Clav to send midi to Sonar to play the Soft Synths (SI Strings)
 

Clavinova
You do need a software instrument to record midi data. However, realize that Sonar will not record the SOUND of your keyboard, only what notes are being played. Basically your keyboard will be controlling the sounds of Sonar. If you want the particular voice of your clavinova, you will need to do an audio out of your keyboard into an audio in on your computer, and use a REAL Audio track.

 

So strange. Now devices are back (I didn't do anything!)
https: //s18.postimg.org/atakw4rhl/image.jpg
But still - no sound.
 

I think you may be having trouble with outputing audio through your audio interface. Have you played any audio tracks successfully yet? 
Like if you plug in the audio output of your Yamaha to the input of the Tascam and record that to an audio track, does that record and playback? 
 
Did you install the newest drivers for the TAscam , use only ASIO mode with Sonar for audio. 
 
And to test a soft synth, insert the soft synth and use the GUI to play a note. Like if you load SI bass you can pluck a string and hear it. 
If your hearing nothing then you need to deal with your audio interface output etc. first. 

None of his links work for me, they are just text? But for some reason your re-postings work? 
 
If his Yamaha uses MIDI via USB then it should show as a midi input and output device,  seem he did install the drivers so it should be on the list. 
But if this is just a case of not pointing the track at a soft synth I guess the light bulb will come on eventually.. I think it's a common problem with newbies.  
 
But in theory he should be able to record the midi from the keyboard to a midi track and send that midi track back out to the Yamaha for playback. But first it has to show on the midi devices list. 
 
We both know this works.. just have to find what's not been set up properly yet.  
Then we'll talk him into using soft synth instead of the sound from the Clavinova.. 

Try this:
 
1.  Insert an audio track.  Find any wav file on your harddrive, then use File Import to pull that into the audio track you just created.  It should show up as a clip if you did it right.  If it didn't, you didn't do it right.  Try again.  Hit play.  Do you hear the wav?  If yes, then at least that bit works.  If no, you have something screwed up in Preferences (hit P) or in your Control Panel devices/sound etc.  You have to solve this bit FIRST.
 
2.  Insert a soft-synth.  Make sure that track strip is highlighted/selected.  Press some keys on your controller.  Do you hear sound?  If yes, you are golden.  If no, your controller (i.e., external keyboard) is not sending MIDI data to the soft-synth.  You need to fix that.  Either the output from your controller is screwed up, or the input to the soft-synth is wrong. Do the little blinky lights in little midi keyboard icon located in the lower right corner of your screen blink when you play the controller?  They should. 
 
3.  Hit record on the soft-synth track and mash some keys on your controller.  Do MIDI notes show up?  If no, go back to #2.  If yes, then hit play.  Do you hear what you recorded?  If yes, you are golden.  If no, well, you've got some weird mess going on that logically seems impossible.
 
4. If you are trying to access an external keyboard or sound source and drive that with midi, all the above has to be functional.   Turn "local" on the external sound source OFF.  When you play the keyboard it makes no sound now because you have disconnected the keyboard from the sound source inside the keyboard.  Insert a MIDI track. Make sure the output send channel is set to the same receive channel on the keyboard.  Now when you press a key, the keyboard makes sound.  IF yes, the MIDI data flow is properly configured.  If no, then it isn't, and you know where to dig to fix.

You are watching a video, not following my most excellent stepwise suggestions.

Were getting there. at least now you have green lights. that means there is activity on that track.
your Tascam has to show in devices.
in the link you posted earlier you had under Devices: 2X2 US.
That would be your audio device. that should be checked off in both upper and lower sections of preferences.
what are using for speakers/headphones to the Tascam unit ?

Try Johnny's idea about dragging an audio file in to Sonar (drag it to an audio track)
see if you can get sonar to produce sound.
your device appears to be set up correctly from what I see.
 
You have the driver installed for the Tascam correct ? ASIO driver ?

make sure you are plugging the Tascam in to the same port you installed your drivers to
(when you installed the drivers) possibly a bad USB port if your losing your audio devise.
 
if you are receiving sound from an audio file (as you said).
then the midi synth in Sonar should work fine.
what this means is there is a routing issue from your midi track to your synth track.
 
The midi track (the midi data) feeds the / sends data to the synth.
this is done by expanding the track in sonar (the midi track) you can see an input (your clav)
and an output (should be sent to SI Strings).
 
However you need to address the disappearing audio device first.