Audio Waveform/Convolution - Knob for Range

[svkpowa]

Hello.

I have a question regarding Audio Waveform component, connected to the jdsp.Convolution in Script FX module.

Is there a possibility to control the start/end points of this panel using a knob? I wanted to implement the "Decay" for convo reverb, but not to force the user to grab the end point of the waveform, I want to manipulate it with the knob. How can I do this?

Thanks!