The first of a sequence of sounds is never played

[dcousin3]

Hello,
I want to show some sounds but the first is never played. I made a minimal example. It uses jsPsych 6.1:

`

            var CueSignalLOW         = 'https://raw.githubusercontent.com/RMG2424/Dr.-Mid-Nite/master/SonBas.wav'
            var CueSignalMID         = 'https://raw.githubusercontent.com/RMG2424/Dr.-Mid-Nite/master/SonMoy.wav'
            var CueSignalHIG         = 'https://raw.githubusercontent.com/RMG2424/Dr.-Mid-Nite/master/SonHau.wav'

            var PlaySound = {
                type: 'audio-keyboard-response',
                stimulus: jsPsych.timelineVariable('sndWave'),
                choices: jsPsych.NO_KEYS,
                trial_duration: 50,
            }
            var NameSound = {
                type:  'html-keyboard-response',
                stimulus: function(){
                    name = jsPsych.timelineVariable('name',true);
                    return( '<p>Here is the '+name+' tone sound</p>'+
                    '(If the sound is too loud, you can reduce volume)</p>'+
                    '<p>Press the {space bar} to hear the sound...</p>');
                },
                choices: [' ']
            }
            var WaitInterTrialDuration = {
                type: 'html-keyboard-response',
                stimulus: '',
                choices: jsPsych.NO_KEYS,
                trial_duration: 500
            }
            var WaitFifty = {
                type: 'html-keyboard-response',
                stimulus: '',
                choices: jsPsych.NO_KEYS,
                trial_duration: 50,
            }

            var SaySounds = {
                timeline: [NameSound, WaitFifty, PlaySound, WaitInterTrialDuration ],
                timeline_variables: [{name:"low", sndWave:CueSignalLOW}, 
                        {name:"middle", sndWave:CueSignalMID}, 
                        {name:"high", sndWave:CueSignalHIG}, 
                        {name:"low", sndWave:CueSignalLOW}, 
                        {name:"middle", sndWave:CueSignalMID},
                        {name:"high", sndWave:CueSignalHIG}
                    ],
                randomize_order: true
            }

            jsPsych.init({
                timeline: [ SaySounds ],
                display_element: 'display_stage',
                'preload_audio': [CueSignalLOW, CueSignalMID, CueSignalHIG], //??

                on_finish: function (data) {
                    console.log("Performing on_finish");
                }
            })

`

Any cue what is going on? It is always the first sound which is not playing, irrespective of which file it is (order is random). I added a 50 msec delay prior to play the sound in case it has to do with rate of presentation, but to no avail.

I wasn't sure how to specify preloading in 6.1, but this does not return an error message. I attach an html file (zipped) where all the code is included along with the html wrappers, ready to go.

TestSound.zip

[dcousin3]

Solution: I upgraded to jsPsych 6.3.1 and now the sound is playing.