i want to sum 7 audio signals ? it keep giving me dimensions does not agree,and when i made all of them the same length and sound the summation i did hear very small part of the signal,how to fix this

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y2=wavread('zero2.wav'); y3=wavread('zero3.wav'); y4=wavread('zero4.wav'); y5=wavread('zero5.wav'); y6=wavread('wavread.wav'); y6=wavread('zero6.wav'); y7=wavread('zero7.wav'); ny1=length(y1); ny2=length(y2); ny3=length(y3); ny3=length(y3); ny4=length(y14); ny5=length(y5); ny6=length(y6); ny7=length(y7); N=min([ny1 ny2 ny3 ny4 ny5 ny6 ny7]); y1=y1(1:N); y2=y2(1:n); y3=y3(1:N); y3=y3(1:N); y3=y3(1:N); y3=y3(1:N); y4=y4(1:N); y5=y5(1:N); y6=y6(1:N); y7=y7(1:N); signal=(y1+y2+y3+y4+y5+y6+y7)/7 the sound of the signal is nothing but very small part of the signals summations

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