def modulate():
	SHRT_MIN=-32767 - 1
	SHRT_MAX=32767
	fl1=0
	fl2=0
	fl3=0
	if wave1.checkvar2.get()==1:
		fl1=1
	if wave2.checkvar2.get()==1:
		fl2=1
	if wave3.checkvar2.get()==1:
		fl3=1
	if (fl1==1 & fl2==1) or (fl2==1 & fl3==1) or (fl1==1 & fl3==1):
		if (fl1==1 & fl2==1):
			wave1.onread()
			cur=os.getcwd()
			cur+=str("/output_file.wav")
			data=readfile(cur)
			fi = wave.open(cur,"rb")
			wave2.onread()
			cur=os.getcwd()
			cur+=str("/output_file.wav")
			data2=readfile(cur)
			fi2 = wave.open(cur,"rb")
			print "hi"
		elif (fl1==1 & fl3==1):
			wave1.onread()
			cur=os.getcwd()
			cur+=str("/output_file.wav")
			data=readfile(cur)
			fi = wave.open(cur,"rb")
			wave3.onread()
			cur=os.getcwd()
			cur+=str("/output_file.wav")
			data2=readfile(cur)
			fi2 = wave.open(cur,"rb")
		elif (fl2==1 & fl3==1):
			wave2.onread()
			cur=os.getcwd()
			cur+=str("/output_file.wav")
			data=readfile(cur)
			fi = wave.open(cur,"rb")
			wave3.onread()
			cur=os.getcwd()
			cur+=str("/output_file.wav")
			data2=readfile(cur)
			fi2 = wave.open(cur,"rb")
		fo=wave.open("output.wav","w")
		fo.setparams(fi.getparams())
		width=fi.getsampwidth()
		width2=fi2.getsampwidth()
		if width>width2:
			width=width2
		fmts=(None, "=B", "=h", None, "=l")
		fmt=fmts[width]
		dcs=(None, 128, 0, None, 0)
		dc=dcs[width]
		if fi.getnframes()<fi2.getnframes():
			maxi=fi.getnframes()
			flag=1
		else:
			maxi=fi2.getnframes()
			flag=2
		amp=[]
		print flag
		for i in range(maxi):
			if flag==1 and i>=fi2.getnframes():
				if data[i]<SHRT_MIN:
					iframe=SHRT_MIN
				elif data[i]>SHRT_MAX:
					iframe=SHRT_MAX
				else:
					iframe=data[i]
			elif flag==2 and i>=fi.getnframes():
				if data2[i]<SHRT_MIN:
					iframe=SHRT_MIN
				elif data2[i]>SHRT_MAX:
					iframe=SHRT_MAX
				else:
					iframe=data2[i]
			else:
				if data2[i]*data[i]<SHRT_MIN:
					iframe=SHRT_MIN
				elif data2[i]*data[i]>SHRT_MAX:
					iframe=SHRT_MAX
				else:
					iframe=data2[i]*data[i]
			iframe-=dc
			oframe=iframe/2;
			oframe+=dc
			oframe=struct.pack(fmt, oframe)
			fo.writeframes(oframe)
		fi.close()
		fo.close()
		pl()
	elif (fl1==1 & fl2==1 & fl3==1):
		wave1.onread()
		cur=os.getcwd()
		cur+="output_file.wav"
		data=readfile(cur)
		fi = wave.open(cur,"rb")

		wave2.onread()
		cur=os.getcwd()
		cur+="output_file.wav"
		data2=readfile(cur)
		fi2 = wave.open(cur,"rb")

		wave3.onread()
		cur=os.getcwd()
		cur+="output_file.wav"
		data3=readfile(cur)
		fi3 = wave.open(cur,"rb")
		fo = wave.open("output.wav","w")
		fo.setparams(fi.getparams())
		width=fi.getsampwidth()
		width2=fi2.getsampwidth()
		width3=fi3.getsampwidth()
		if width>width2:
			width=width2
		if width>width3:
			width=width3
		fmts=(None, "=B", "=h", None, "=l")
		fmt=fmts[width]
		dcs=(None, 128, 0, None, 0)
		dc=dcs[width]
		if fi.getnframes()<fi2.getnframes():
			maxi=fi.getnframes()
			flag=1
		else:
			maxi=fi2.getnframes()
			flag=2
		if fi3.getnframes()<maxi:
			maxi=fi3.getnframes()
			flag=3
		amp=[]
		for i in range(maxi):
			if flag==1 and i>=fi2.getnframes():
				if data[i]<SHRT_MIN:
					iframe=SHRT_MIN
				elif data[i]>SHRT_MAX:
					iframe=SHRT_MAX
				else:
					iframe=data[i]
			elif flag==2 and i>=fi.getnframes():
				if data2[i]<SHRT_MIN:
					iframe=SHRT_MIN
				elif data2[i]>SHRT_MAX:
					iframe=SHRT_MAX
				else:
					iframe=data2[i]
			elif flag==3 and i>=fi3.getnframes():
				if data3[i]<SHRT_MIN:
					iframe=SHRT_MIN
				elif data3[i]>SHRT_MAX:
					iframe=SHRT_MAX
				else:
					iframe=data3[i]
			else:
				if data2[i]*data[i]*data3[i]<SHRT_MIN:
					iframe=SHRT_MIN
				elif data2[i]*data[i]*data3[i]>SHRT_MAX:
					iframe=SHRT_MAX
				else:
					iframe=data2[i]*data[i]*data3[i]
			#	print int(iframe)
			iframe-=dc
			oframe=iframe/2;
			oframe+=dc
			oframe=struct.pack(fmt, oframe)
			fo.writeframes(oframe)
		fi.close()
		fo.close()
		pl()