Elsewhere in this thread people linked to devices that did exactly this https://usb.brando.com/usb-cassette-mp3-player_p01122c035d15.html https://usb.brando.co

Elsewhere in this thread people linked to devices that did exactly this https://usb.brando.com/usb-cassette-mp3-player_p01122c035d15.html https://usb.brando.com/usb-cassette-mp3-player_p01122c035d15... https://pt.aliexpress.com/item/4000181019563.html?gatewayAdapt=glo2bra https://pt.aliexpress.com/item/4000181019563.html?gatewayAda... They receive a mp3 (or other format) and output sound through the magnetic stripe (and also to headphones if you don't put it in a walkman)