Sadly not, it would of made things a bit easier haha.
Let me be a bit more precise on how I can observe the issue.
Starting from any program, I press down *transpose -Down- and -Up-* simultaneously and then I press *Hold*, which sends me to the default Basic Parameter. With this parameter, as it is said in the manual, I only have one oscillator active with a saw shape.
Then, when I press a note, it is played at the "normal volume". When I play a second note, it will drop in volume. When I play a third note, it will drop once more in volume. This happens incrementally as described until I reach the 8th note, where I almost have no sound at all. Then, if I hit a 9th note, it goes back to full volume. Then the cycle goes on as I described.
I have tried resetting all Global Parameters, but the issue stayed the same.