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Picked up this setup again after adding a pro sound mod.

The EMS cart is definitely flaky; in LSDJ in the chain screen it keeps setting the transpose value to the phrase value.

Random behaviour returned where transpose value are being changed when switching back and forth between screens.
So I replaced the battery of my EMS smart card and now LSDJ won't start anymore. It keeps saying to clean pins or replace the battery.
I've tried 2 new batteries. Is my EMS smart card dead?

:edit as mentioned by another member here leaving it on for a while got rid of the error screen :-)

Gave this another try today with LSDJ version 5.3.6 and another total memory reset.
Everything works as expected; I can transpose and hear the high notes.

After collecting dust for almost 3 years I finally installed the back light in my DMG Game Boy and started playing around with LSDJ again.

I'm currently working on a song where I want to transpose a phrase.
After transposing to the 6th octave and up I don't hear any sound after C 6. How can this be fixed?

I'm using an EMS 64M USB Cartridge and LSDJ version 5.3.5.

:edit issue with strange LSDJ behavior seems to be resolved by total memory reset / removing & inserting save cart battery / rewriting ROM to cart