public class FluteSweep  {
    Flute f;
    int sweeping;
    
    public void connect(UGen ugen) { f => ugen; } // connection

    public void blow(float freq) { // blow with float argument
        freq => f.freq;
        1 => f.noteOn => f.pressure;
        spork ~ sweepUp(); }        

    public void blow(int note) {  // overload/polymorph function
        blow(Std.mtof(note)); }   // use existing mechanics
    
    public void shaddap()  { 
        1 => f.noteOff;           // noteOff
        0 => sweeping; }
    
    private void sweepUp()  {
        0.5 :: second => now;     // let the note establish
        f.freq() => float temp;   
        temp * 8.0 => float temp2;
        1.0 => float bl;
        1 => sweeping;
        while ((temp < temp2) & sweeping)  {
            temp * 1.02 => temp => f.freq;    // sweep freq up
            0.93 * bl => bl => f.noteOn;  // ramp down blowing
            0.01 :: second => now;
        }
    }
}