Hey there David! I really enjoyed the song while I was reading your creative process. I'm a huge fan of Alice in Chains, I heard their influence right away in your harmonies. I use the same technique to make my harmonies too! Just singing along the main line until I find the harmony that fits the best.

I used Modo bass one time too, because I don't have a 5 string bass and I had to use a plugin to simulate that. For acoustic drums sounds I use Steven Slate, pretty happy with the free version.

I'm glad to find other skilled musicians here, cheers! ✌️