I ended up trying again and making it work, settled for a single tick when going green so it doesn't get too noisy when fast!
Viewing post in Heat Control - edging trainer comments
What's been done covers the need of several user's suggestion (the noise not only indicate it's green, it also gives you the stroke rhythm without having to focus on the flashing).
And I realise my previous post was ambiguous: I really meant "a tick when flashing green", as opposed to also a tick when the flash goes black too. Anyways,
Please contact me on Discord or Telegram if you *really* want this, can talk there.