Yeah Volca Mix looks really cool! you should also check the Patchblocks PBMIX3 https://ask.audio/articles/review-patch-blocks-pbmix3 and the Vixen mixer by KV Gear https://www.kickstarter.com/projects/vixenmixer/vixen-mixer

Although I think the Volca Mixer has more features, those mixers I posted were made before the actual Volca Mixer, but worth checking out!

Have fun making music!