Multi Sampler - is this a bug?

[Dark Lane]

Hi Folks

I'm trying to use the version of Multi-Sampler bundled with Waveform 11.5 (can't find a version number on the plugin itself).

Anyway, in the Sound screen, I'm trying out linking the envelope/LFO modulation to the filter cutoff by clicking on the 'arrow + knob' button in the corner of the envelope/LFO graphic (does it have a name? There's no pop up help to tell me) and then moving the filter cutoff with my mouse. All fine and creates a modulation 'matrix'. And if I want to delete it, I can right-click and click on the modulation source name.

BUT this doesn't work for the amplitude (A) envelope. Although the name is visible when I right click, I can't delete the link. Very frustrating as I have to delete the sound layer and start again. As I said, it DOES work for other modulation sources i.e. envelope 1 and 2 and LFO 1 and 2.

Anyone know another way to delete this mapping? Or am I missing something?

Cheers

Steve