QT chooser and QT range do not cooperate with each other

Hi all,

I have a flowgraph with QT chooser choosing between rect pulse and rrc pulse.

I also have a QT range where I want to control the rolloff factor of the rrc pulse when chosen.

However, in the flowgrpah it seems that once the rrc is chosen I cannot change its roloff factor dynamically from the QT range.

I have tried it in both 3.7 and 3.8 and I get the same result.

Is this a bug?

Is there a more appropriate way of achieving this result?

thanks

Achilleas