On , Paul Davis &lt;paul@linuxaudiosystems.com&gt; wrote:<br />&gt; gtk2_ardour/canvas-waveview.c <br />Thanks for the pointer, indeed it seems quite complex to me :D<br /><br />I was concidering doing all RMS calculation or max / min in a seperate thread, and keep the results local in the GUI.<br />I&#39;ll guess thats roughly what all the cache operations are in the canvas_waveview.c<br /><br />@Robin: Thanks for the other scope examples, I&#39;ll look into them. The Max / Min code is probably easiest, I&#39;ll try that :)<br /><br />Cheers, -Harry