Use Slack's own default notification sound (or let me provide custom sounds)

[jszobody]

I find Wavebox's default notification sound for Slack to be jarring, and I'm not thrilled with the other notification sound options either. I'd really like for Slack in Wavebox to use Slack's own default "knock brush" sound: https://www.voicy.network/clips/C4z8EeIEckuFWbZKVnvi9g

Can Wavebox include this and provide it as a notification sound option? If there are legal/licensing issues preventing you from including "knock brush" in Wavebox directly, could you allow me to add my own custom mp3 notification sounds?