Usually with these things I've to actively turn off the silent switch on my iPhone for audio to be enabled. Definitely if it's a Tone.js app, which it probably

Usually with these things I've to actively turn off the silent switch on my iPhone for audio to be enabled. Definitely if it's a Tone.js app, which it probably is? They should be able to detect it's an iphone and issue an warning message for that though seeing as a lot of people will have that switch enabled