Question: Are there any plugins that can help me slow down audio tracks to create harmonically rich, melancholic versions?

If you're looking for plugins to help you slow down audio tracks and create harmonically rich, melancholic versions, Orb Plugins is a good place to start. Orb Plugins is a suite of AI tools geared specifically for music composers, producers and DJs. One of its most interesting tools is Orb Tempus, a polyphonic harmonic decelerator that's designed to slow down music and harmonically transpose it. That can be useful for getting the melancholic and harmonically rich sound you're looking for.

Another tool worth checking out is Moises, an AI-powered audio manipulation and separation tool. Moises includes smart metronome and audio speed changing abilities that can be useful if you want to practice or create music at a slower tempo, adjusting the pitch and key to suit your needs. That kind of flexibility can be important to getting the mood you want out of your music.