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Audiovisuals with SC - Example08b - faster is slower

See /f0blog/audiovisuals-with-sc/

//Example08b - faster is slower
//only one line differs from Example08a.  the one in the main loop where we invert the mapping.
(
s.latency= 0.05;
s.waitForBoot{
    //--window setup
    var width= 640, height= 480;
    var w= Window("Example08b - faster is slower", Rect(99, 99, width, height), false);
    var u= UserView(w, Rect(0, 0, width, height));
    //--variables
    var pat= Pn(Pshuf(#[0, 0, 0, 0, 0.1, 0.25, 0.5, 0.75, 1, 1], 8), inf).asStream;
    var syn= SynthDef(\av, {|rate= 1|
        var x= Decay2.kr(Impulse.kr(rate), 0.01, 0.1, 2, 0.2);
        var z= LPF.ar(LFSaw.ar(#[300, 301, 80, 81]).mean, 2000, x);
        Out.ar(0, Pan2.ar(z));
    }, #[0.05]).play(s);  //short lag time to avoid clipping
    var posx= 0;
    var fre= 0;
    //--interface
    ~radius= 100;
    ~fps= 60;
    ~spreadx= 100;
    //--main loop
    u.drawFunc= {
        if(u.frame%~fps==0, {  //pick a new frequency only once per second
            fre= pat.next;  //get the next value from the stream
            syn.set(\rate, 1-fre*4+1);  //send to the synth
        });
        posx= sin(u.frame*(fre+1)%50/50*2pi);
        Pen.translate(width*0.5, height*0.5);  //offset drawing to the centre
        Pen.fillColor= Color.white;  //always fill with white color
        Pen.fillOval(Rect.aboutPoint(Point(posx*~spreadx, 0), ~radius, ~radius));
    };
    //--window management
    u.clearOnRefresh= true;
    u.background= Color.black;
    w.onClose= {syn.free};
    w.front;
    u.animate= true;
    CmdPeriod.doOnce({if(w.isClosed.not, {w.close})});
};
)
//change these while the program is running
~radius= 200;
~radius= 50;
~spreadx= 250;
~radius= 15;
~spreadx= 40;
//close the window to stop or press cmd+.