Chord Note Sound doesn't play on IOS

[LefanTan]

Describe the bug
A Guitar note sound should have played when clicking on the chord note button ( 1,b3,5 etc), works fine on MacOS, Windows and Android and NOT IOS.

To Reproduce
Steps to reproduce the behavior:

1. Chords Page
2. Click on any chord (maj etc)
3. Click on '1' on one of the Chord shapes
4. observe that no sound are played

Screenshots

Smartphone (please complete the following information):

• OS: IOS
• Browser: Safari

Additional context
I expect that it is the audio context in HelperFunction.js not being set up properly for IOS. It was previously fixed but I've only got it to work on MacOS.