Using New Ping library and TONE together

hello,

i thought throw code varying tone distance returned hc-sr04 ultrasonic module.

i thought mapping returned distance using newping library in conjunction tone. compilation error message:

 
arduino: 1.0.6 (windows 7), board: "arduino mega 2560 or mega adk"
core.a(tone.cpp.o): in function `__vector_13':

c:\program files\arduino\hardware\arduino\cores\arduino/tone.cpp:535: multiple definition of `__vector_13'

newping\newping.cpp.o:c:\documents\arduino\libraries\newping/newping.cpp:214: first defined here
c:/program files/arduino/hardware/tools/avr/bin/../lib/gcc/avr/4.3.2/../../../../avr/bin/ld.exe: disabling relaxation: not work multiple definitions

i'm using mega-2560. there fundamental problem of using pwm's together? can post code if wants look?

thanks.

code is:

#include <newping.h>

#define trigger_pin  12  // arduino pin tied trigger pin on ultrasonic sensor.
#define echo_pin     11  // arduino pin tied echo pin on ultrasonic sensor.
#define max_distance 300 // maximum distance want ping (cm).

newping sonar(trigger_pin, echo_pin, max_distance); // newping setup of pins , max distance.

void setup() {
  serial.begin(115200); // open serial monitor @ 115200 baud see ping results.
}

void loop()
{
  delay(50);           // wait 50ms between pings.
  unsigned int = sonar.ping_median(10);   //multiple readings returned in microseconds.
  serial.print("ping: ");
  unsigned int dist = (us / us_roundtrip_cm);  // convert ping time cm , print result.
  serial.print(dist);                                          //print distance.
  serial.println("cm");

  // map distance range (in case, 1cm 300cm ultrasonic sensor.
  // output pitch range (120 - 1500hz)

  unsigned int thispitch = map(dist, 1, 300, 120, 1500); //map distance.
 
  tone(9, thispitch, 10); // play pitch:
  delay(1);        // delay in between reads stability
}

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