This is my first Post here. Some days ago I bought a Mother 32 and in Process of learn with this beautifill Piece

Perhaps a Noob Question, but how can I modulate the Pulse Width of the VCO Saw Wave? Perhaps something is wrong with my Unit.
But i can not make any changes for the Pulse Width for a Saw Wave and can not Modulate it. I just can Modulate the Frequency of the Saw Wave.
For the Pulse Wave everything work fine. With other Synths (Analog Keys) it is possible to Modulate these things.
What is wrong?
Thank you for your Support!