hello. i have a sony netMD MZ-N505 and after recording from an external mixer, i am unable to upload to my computer using sonic stage. i get the following error message: Unable to transfer the following tracks to My Library because they are recorded by Net MD or another computer. is there a setting that i need to adjust for this to work. basically what i am doing is mixing music and recording from mixer to netMD and my intention is to connect and upload to computer for editing. thanks!