Welcome to r/You_Dot_DJ, this is a subreddit to share music made with you.dj please only post videos of your music and/or links to them. Please keep this in mind and do not deviate from this topic. Thank you, and enjoy posting. Source: over 1 year ago

Mixxx is an open source and free desktop app, https://you.dj/ is a simple browser based DJ software. Source: over 1 year ago

What do you mean? Stream what you are doing to other people? Like twitch. Or a browser based dj software? https://you.dj/. Source: over 1 year ago

I think https://you.dj/ has support for midi devices. Source: about 2 years ago

Welcome to r/You_Dot_DJ, this is a subreddit to share music made with you.dj please only post videos of your music and/or links to them. Please keep this in mind and do not deviate from this topic. Thank you, and enjoy posting. Source: over 2 years ago

Found this article which suggests Mac Media Key Forwarder or BeardedSpice. Source: about 1 year ago

If you're on macOS, BeardedSpice should work: https://beardedspice.github.io/. Source: over 1 year ago

Use beardedspice to map the multimedia keys: https://beardedspice.github.io on the K3. Source: over 2 years ago

I think https://beardedspice.github.io used to do this but it hasn't been updated since 2017 and doesn't work properly for me. Source: over 2 years ago

BeardedSpice lets you bind them to a specific player. Source: over 2 years ago