Jeff Greenlee

I want to make a M4L device that will be able to refresh displayed track properties when ever a different track is selected within Live 9.7. I have been trying to use "live.observer" but I can't seem create a live.observer object that will output - or at least bang whenever the current "selected_track" changes. 

I can successfully make something happen if I user an observer like this: "live.observer is_playing" for example. 

But this: "live.observer live_set view selected_track" does not work. That seems like a valid path in the Live API model. I can get the id for that with live.path but I can't get something to trigger anything when the selected track changes. Why not?

I want to make a M4L device that will be able to refresh displayed  track properties when ever a different track is selected within Live 9.7.   I have been trying to use "live.observer"   but I can't seem create a live.observer object that will output - or at least bang whenever  the current  "selected_track"  changes.    

I can successfully make something happen if I user an observer like this:  "live.observer is_playing"  for example.  

But this:  "live.observer live_set view selected_track" does not work.  That seems like a valid path in the Live API model.    I can get the id  for that with live.path   but I can't get something to trigger anything when the selected track changes.  Why not? 

I want to make a M4L device that will be able to refresh displayed  track properties when ever a different track is selected within Live 9.7

how-to-detect-when-when-"selected_track"-has-changed

Using the middle outlet of live.path will update when this path changes. 

The selected track is an object, not a property. You can only use observers to watch properties, not objects.

Using the middle outlet of live.path will update when this path changes. 
The selected track is an object, not a property. You can only use observers to watch properties, not objects. 

Ok! Thanks so much for that! I have successfully used it to detect when a Track changes and update some values. 

Now though I have another confusing Issue I am trying to solve:

So I have my selected Track now.. and I can update the TrackID so that say the track name gets updated.. But NOW I want to grab more details about the "selected track" which requires that I navigate the API path to lets say display the current volume... or panning level. 

I have a message like this passed into live.path "goto live_set tracks $1 mixer_device volume" ... but the problem is that can't use the DeviceID as an argument for $1! (Argggghhh ! that would be too easy!) "goto" will only take track number. Upon looking up forum threads on this everyone says to just use "live.thisDevice". But for me that won't work.. because the MAX device I am making is intended to be added the Master track... and so.. I need a way to convert, or learn what the current current number is! Is there a way to do that?

Ok!  Thanks so much for that!  I have successfully used it to detect when a Track changes and update some values.  
Now though I have another confusing Issue I am trying to solve: 

So I have my selected Track now.. and I can update the TrackID  so that say the track name gets updated..  But NOW I want to grab more details about the "selected track"   which requires that I navigate the API path  to lets say display the current  volume... or panning level.  

I have a message like this passed into live.path   "goto live_set tracks $1 mixer_device volume"  ... but the problem is that can't  use the DeviceID as an argument for $1!   (Argggghhh !  that would be too easy!)    "goto" will only take  track number.   Upon looking up forum threads on this everyone says to just use "live.thisDevice".   But for me that won't work.. because the  MAX device  I am making is  intended to be added the Master track...  and so.. I need a way to convert, or learn what the current  current number is!   Is there a way to do that?    

Yes I would like to do the same thing basically. I have a 'master midi' track and want to convert the DeviceID to the track number...

How to detect when when "selected_track" has changed?