That was quick, thanks a lot! I have trained different models on musical (MIDI) sequences and you are right in practice it does not really change a lot.
One thing i noticed though is that the KL divergence is lower if the parameter, lets call it c for now, is higher. So the grey plot used c=0.2 for this value the blue plot c=0.5 and for the turquoise plot i set it to c=1. Reconstruction loss is pretty much the same.