Grabbing Midi Chanels at once

dear members,
i`m newbie in programming arduino. created code grab piezo sensors , send signal different midi chanels. same time push piezo led should glow. works pretty noticed don`t work when hit 2 sensors same time, please me issue? furthermore shure make code more efficient defining more variables. thx help....her code:

int noteon = 144;
int piezo = a0;
int piezo1 = a1;
int piezo2 = a2;
int threshold = 500;//anything on fifty means we've hit piezo


void setup(){
  pinmode (2, output);
  pinmode (3, output);
  pinmode (4, output);
  serial.begin(9600);
}

void loop(){
  int piezoval = analogread(piezo);
  int piezoval1 = analogread(piezo1);
  int piezoval2 = analogread(piezo2);
 
  if (piezoval>threshold){
    serial.write (noteon);
    serial.write (36);
    serial.write (127);
    digitalwrite(2, low);
    delay(100);
   
    digitalwrite(2, high);
  }
   
  if (piezoval1>threshold){
    serial.write (noteon);
    serial.write (37);
    serial.write (127);
    digitalwrite(3, low);
    delay(100);
   
    digitalwrite(3, high);
 
  }
  if (piezoval2>threshold){
    serial.write (noteon);
    serial.write (38);
    serial.write (127);
    digitalwrite(4, low);
    delay(100);
   
    digitalwrite(4, high);
}}

if (for example) piezo1 exceeds threshol,d write info, digitalwrite , delay(100). if, say, piezo2 had exceeded threshold @ same time, time delay piezo1 over, piezo2 have dropped below threshold don't see happen.
you need implement variation of "blink without delay" code can respond simultaneous events.

pete

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