TLC 5940 and pushbutton control

hi! i'm trying hard control individual leds hooked tlc 5940.

1. use push button turn led on , off (i can of course regular sketch using solution (from book), i'd access individual led controls within tlc 5940:
 if (val == high) {
 digitalwrite(led, 1);
}else{
 digitalwrite(led, low);

2. keep line of 16 leds running 1 (or more leds) on - each controlled own push button.

here's sketch far, , - i've taken out parts don't work, line of leds works way i'd to, , i've added dial potentiometer control speed of leds.

code: [select]

#include "tlc5940.h"
#define analog_pin1      1
#define button 2
#define led 7

int val = 0; //me
int val2 = 0;  //me

void setup()
{
 tlc.init();
 pinmode(button, input);  
   pinmode(led, output);
}

void loop()
{
 for (int channel = 0; channel < num_tlcs * 16; channel += 1)
 {
   int direction = 1;

   tlc.clear();
 
   tlc.set(channel, 25); //mr- changed (channel, 0) value 1000 0 stop gradual fade light light.
   
   tlc.update();
   
       delay(analogread(analog_pin1));   //me
       
//          val = digitalread(button);
         val2 = digitalread(button);
 
//  if (val == high) {
//  digitalwrite(led, 1);
// }else{
//  digitalwrite(led, low);
// }      

// if (val2 == high) {  //me
// digitalwrite(channel = 4, 25);  //me
//  } else {   //me
//  digitalwrite(channel = 4, 0);   //me

//  }
}
}

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