In addition to using pre-recorded audio files, magpie also provides a synthesizer for creating auditory stimuli.
The synthesizer is available via the Synth component:
<Synth :frequency="440" />
This will produce a 440 Hz tone via the participant's sound system as long as the component is being rendered (i.e. as long as the current slide is visible).
You can also use pitch-octave notation to set the frequency:
<Synth frequency="D3" /> <Synth frequency="F#3" /> <Synth frequency="A3" />
This will produce a D major triad.
Instead of letting the tone ring for as long as the component is being rendered, you can also specify a duration in seconds:
<Synth frequency="D3" :duration="3" />
Similarly, the volume can be adjusted by specifying a normalized decibel value (0 being the loudest, with the sound getting quieter as the value gets more negative)
<Synth frequency="D3" :duration="3" :volume="-8" />
There are other controls available that you can experiment with in the reference: Synth