I saw some really cool art last year using MD as a base and as an artist I decided to try too. Please don't make mean comments

I'd like to know what the problem is. The device is working and it reads the disc, but when I play it, I can't hear any sound. I've tried several pairs of headphones, but the problem is still the same.

What a fun serie!

https://www.theminidiscshop.com/product/com-alliance-chum-80-entire-serie-used-minidiscs

I'm almost 100% certain this has been asked in the past, however - are gumstick batteries universal sizes, depending on the brand of MD/CD players? As you all know I have a lovely little collection of Sony recorders and a Sharp player. I'm about to potentially add a couple of Kenwood Player's and a Panasonic portable CD Player, all of which take Gumsticks. From what I can gather, the CD player specifies a certain type of batt. Any thoughts/feedback?