st.tools bow instrument: how to make glissanto?

Hi,

I work with the st.tools bow sound. I am trying to get around the piano-style onset of tones and instead make a glissanto at x amount of miliseconds (see the red subpatch gliss in the below pasted patch ...)

However, right now the glissanto consist of an onset of several notes ... all the notes between the two frequencies that I want one note to 'slide' between.

How do I make a glissanto between frequencies and only onsetting ONE note?

Thanks,

ana