Hi Johan, thank you for getting back. I tried both songs and a third one which contains just a single pattern. Everything seems to work, songs and patterns are recognized from the SD card, and I can browse through the data. However, in play mode, the sequencer either freezes on pattern change (rare) or looses ALL song information (90% of the time) in that very moment. It keeps moving forward in time, but shows no song info, i.e. all patterns are empty after that event until I reset the sequencer. When reaching the end of the song , the sequencer stops and goes back to the first pattern, which is now also empty. When I e.g. change the song after this event, or hop around in edit mode, all data seems gone. Interestingly, however, everything is working perfectly if I manually pause a running song for a fraction of a second in each pattern. In this case, I get correct pattern changes without issues in 100% of the time…