Q:  3.14.18  3:15 pm I have an audio interface, so you would say it would work just connecting the  piano to the interface with midi cables,
A: oh, i thought you were doing audio. if it's audio, use an audio cable and then probably USB to the computer. if it's MIDI, you probably don't need an interface it's probably just USB, but if your keyboard is really old you would actually need a MIDI interface and MIDI cables, and then who knows how it would connect to the computer because it's probably older than USB. oh i almost forgot, i don't think audacity does MIDI, that's probably why i assumed you were doing audio