I'd recommend not powering up the synth again until it has been properly tested by a technician. Thanks in advance for any help anyone can offer. Is the card issue likely to be a result of another problem not listed above or.what? Seems highly unlikely that all 5 cards stopped working, and as I was using them fine when I was getting the low battery alert 20 years ago, it doesn't seem as though that would be the problem either. They all worked fine last time I used them, but now, I get an error message for all five cards as soon as I switch the unit on with card inserted - 'the card is not formatted'. 4 are for the prog slot and 1 for the PCM slot. My question is regarding the 5 Korg memory cards I have, which I wanted to sell separately. I understand that all these problems can potentially be fixed by someone who enjoys mucking about with old synths and unscrewing back panels from things (I'm not into either). I also discovered that a key is now sticking, and that, while the display itself is fine, the blue screen light is not working. Last time I used it, I remember a 'low battery alert' stopped me from saving any edited patches, and that's obviously still the case. I used it a lot back then but haven't touched it for over 20 years, so it required a bit of testing to see if it still works okay. I'm looking at selling a Korg Wavestation that I've had since the early 90s.

I know almost nothing about synths so bear that in mind if/when I say something dumb.

Korg wavestation ws1 battery