The message is not being sent. I set the callbacks of the payer and test it 
with:
        set the callbacks of player 1 to "0,soundNotes"

        command soundNotes
          — does not get sent
          put the params
        end soundNotes

        on currentTimeChanged theInterval
          put theInterval
        end currentTimeChanged

        on playPaused
          put the currenttime of me
        endplayPaused

As I understand it the callback timing should be in “intervals"

• The duration of player 1= 4665600
• The  timescale of player 1 = 90000

Setting the callbacks to a range of values between 0 and the duration seems to 
have no effect with regard to messages actually being sent. I’ve tried putting 
the “soundNotes” handler in various positions - card, stack and player. Still 
debugging...
On 28 Jun 2020, 06:35 +0100, Peter Bogdanoff via use-livecode 
<use-livecode@lists.runrev.com>, wrote:
> David,
>
> Specifically what is not working? Setting the callbacks, the callbacks 
> message not being sent or received?
>
> Sometimes I’ve seen that the interval between callbacks is so great, that the 
> message is never sent before the player ends. That is highly dependent on the 
> timeScale of the player. Put in the message box after the file is loaded into 
> the player:
>
> put the timeScale of player “<player name>”
>
> to see if the numbers make sense. Some files will have very different 
> timeScales (a Mac file with 600/second may have a Windows equivalent of a 
> number in the millions).
>
> Peter Bogdanoff
>
> > On Jun 27, 2020, at 1:41 PM, David Bovill via use-livecode 
> > <use-livecode@lists.runrev.com> wrote:
> >
> > I’ve been testing an idea for an app - and I can’t get the callbacks 
> > property sending of messages. Does it still work with 9.6 MacOS?
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