// adc => blackhole;             // DON'T DO THIS! (it stays connected)
adc => Gain input => blackhole;  // lets us look at individual samples
Impulse output => dac;           // Lets us write out individual samples

while (1)  {
    if (input.last() > 0.9) <<< now, input.last(), "LOUD!!" >>>;
    input.last() => output.next;      // copy input to output if you like
    1.0 :: samp => now;               // every sample
}