Hi Alec, thanks for your clarification. Sounds like a 128mg SD card should be sufficient for on board KN7000 audio file storage needs. Great to hear that you can easily send both the KN7000's sequencer tracks (as audio) along with vocals, directly to your PC to record as a WAV file (with supplied software) and then be able to transfer it back to the SD Card as a MP3 file, for playback on the KN7000. What a great way to have the KN7000 act as a MP3 player during breaks. I assume the KN7000 will let you customize MP3 song playlists too, right? Does the KN7000 also support WAV format file playback, or just MP3? Either way, I'm getting really excited about the prospects of owning a Technics arranger keyboard again.