Fresh Install - No sound on Firefox

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Hi Moltke,
I've found a possible solution for the same problem on an ASUS E200HA notebook which specs (https://www.asus.com/us/Laptops/ASUS-Viv...fications/) are similar to mine (https://www.kogan.com/au/buy/kogan-atlas...-notebook/).

Please have a look at this and see if it makes sense to you:
https://github.com/heikomat/linux/tree/c...and_manual

I haven't acted on anything as I don't have any confidence about messing up with Linux.

Thanks!