// patch
Impulse i => LPF f => dac;
float t;

// go!
while( true )
{
    // sweep
    100 + (Math.sin(t)+1)/2*5000 => f.freq;
    // increment
    .1 +=> t;
    // fire!
    2 => i.next;
    // advance time
    100::ms => now;
}