I want to make like a portable mp3 player, where you can upload your songs to a micro sd card, and then play them throgh the sound generator to a 3.5mm headphone jack you can listen to. I found the cheao micro sd card reader module to use. I put the pins to it in the kicad schematic, added the main mcu (pico 2 or 1, wich i already have from another project) and added things like oled display ports and simple battery connector, wich i will expand later. I want it to be on lipo battery.