ATtiny Capacitive Sensing and Sound

hi everyone,

i'm trying sketch working on attiny85-20pu allow me capacitive sensing chip whilst changing  sound output. sketch wanted use one, amended version of paul badger's (there h file in folder too):

#include <capacitivesensor.h>

capacitivesensor   cs_4_2 = capacitivesensor(4,2);        // 10m resistor between pins 4 & 2, pin 2 sensor pin, add wire , or foil if desired
int speakerpin = 12;
int pitch = 0;
int ledpin = 13;

void setup()                   
{
   
   serial.begin(9600);
}

void loop()                   
{
    long start = millis();
    long total1 =  cs_4_2.capacitivesensor(100);

    serial.print(millis() - start);        // check on performance in milliseconds
    serial.print("\t");                    // tab character debug windown spacing

    serial.println(total1);                  // print sensor output 1

    delay(10);    // arbitrary delay limit data serial port
   
  pitch = total1/26;
  tone(speakerpin, pitch);
  analogwrite(ledpin, total1);
  delay(10);
}

but isn't working - think read somewhere attiny's can't serial?? tried tone based sketches working aren't either....the core i'm using one: https://code.google.com/p/arduino-tiny/downloads/detail?name=arduino-tiny-0150-0020.zip

any advice ace - thanks!

attiny85 can software serial, claim works. have set fuses 8mhz , external crystal/resonator desired.

your attiny core arduino 1.5, don't use ide because if use arduino uno, mega and/or attiny recommend arduino 1.0.5 stability.

i've used tone library flawlessly library (same page, different core version arduino 1.0.5)
https://code.google.com/p/arduino-tiny/downloads/detail?name=arduino-tiny-0100-0018.zip

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