Hello,

for plotting signals in KTechLab, in the future, maybe SciDAVis or LabPlot 2 could be used. I guess they work investigating. Please find details at the links below:

http://dot.kde.org/2009/10/16/labplot-and-scidavis-collaborate-future-free-scientific-plotting

http://scidavis.sourceforge.net/

http://labplot.sourceforge.net/

Best regards,

 Zoli