UK Piano Page Piano Forum
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If you want to record your performances to your computer AS THEY SOUND from the keyboard, you are going to have to consider investing in a USB Audio Interface or a software generator where the sounds are actually stored on the computer.
Most guys are coping with videoing their performances and posting links which is fine and is cheaper to do. I should say, the other method mentioned above would provide a better sound quality and will give you more control over editting and arranging performances using more than one layer or sound at a time.