adc => OnePole p => blackhole;	// basic patch
3 => p.op;	 adc => p;				// now we have a squarer
0.999 => p.pole;

0.0 => float myRMS;

spork ~ RMS(0.05);	// setup a 50 ms. update loop

while (1)	{ // do stuff if you like here
    0.5 :: second => now;
    <<< "RMS = ", myRMS >>>;   
}

fun void RMS(float howoften)	{
    while (1)	{
	howoften :: second => now; 
    	Math.sqrt(p.last()) => myRMS;
    }
}