nostr:npub103tf8tphd44zpth69x46lf2ym0cckk3z59dvrl68vl5uylx0599q7ym2kn nostr:npub1nyrffka7pl0yutpz80j3gmknlqqyymd58ppqsjkc3g3jsyakkqhqr0xs0p what's that midi captain do?