The PO-33 uses an audio data stream to transfer information to and from your computer. This method is similar to how old home computers used to save and load data to tape. I had mixed results with the reliability of this process on the PO-33 (and the original Korg Volca), but the tips below helped sort things out.
Tip 1 (general tip for any hardware using this method) - on your PC turn off any 'audio enhancements'. This can distort the signal which can lead to failed backup/restore. Having a look in your system tray, there may be an audio app running that is applying EQ or effects to default audio, this can hinder the backup/restore which needs as clean a signal as possible.
Tip 2 (PO-33) - check that when taking a backup, the file is stereo. Load up the .wav and zoom right in, there should be different data on each channel, if not, it has been recorded in mono and will not restore as expected. Some audio input hardware will be mono only and a cheap audio interface may be needed. You also need to select stereo input/output in the software you are using to record.
Tip 3 (PO-33) - if you are having trouble with your own backup/restore, first start with something known to work, to iron out any issues with your local setup. There is a free sample pack on the Teenage Engineering site here, suggest you try to restore this. If that works, then do a backup of this restored data and then try to restore that.
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