Greetings all, I guess title says it all. I do have working examples (i.e. the sequencer example from the LAD 2004) that make new instances of synths but none of them actually do real-time updates to existing instances. At any rate I would greatly appreciate your help in this matter. This is as far as I got and cannot figure it out beyond this point (my brain is pretty darn fried :-): s = Server.local.boot; SynthDef("onetwoonetwo",{ arg out=0, freq; w = SCUMWindow.new; w.title = "Slider example"; w.initialSize = Size(20, 300); c = SCUMVBox( w ); v = SCUMSlider(c, { |v| v.expand = 1; v.fill = 1; v.bgColor = Color.white; v.fgColor = Color.black; v.action = { freq = v.value * 100; }; v.doAction; }); w.show; Out.ar(out, SinOsc.ar(freq + 400, 0, 0.5) ) }).play; What I am simply trying to do is to affect the frequency of the sinetone by moving the slider, yet nothing changes when I move the slider. Any help would be greatly appreciated! Best wishes, Ico