[LAD] LV2 Oscilloscope

Hi all, I'm still trying to improve the avw.lv2 plugin set (reminder, the port of AMS internal modules), and one of the new plugin I would like to have is a visual oscilloscope - it's very useful when working with modular synth to see what the Osc/LFO are at. At the moment i'm using the DSSI ll-scope but although it works very well for low frequencies, the refresh rate is not that great for very high frequencies - half the graph is not displayed and if I setting it in frozen mode doesn't work that great for Osc/LFO that changes shape with time. My plan was to use the ll-scope gtk widget, add it to a LV2 plugin and start from there. The problem I'm at the moment facing is this: - ll-scope widget requires the sample rate as a constructor but I can't find an easy way for an LV2 plugin to pass the sample rate. - what is the cleanest way to access input port data from the GUI? GUI and plugin are very well separated in LV2, I can't figure out what's the proper way to do this. Thanks in advance for everyone's help :) Aurélien