diff --git a/DarellsAnnex/DarellbandpassFilter.m b/DarellsAnnex/DarellbandpassFilter.m
new file mode 100644
index 0000000..918358a
--- /dev/null
+++ b/DarellsAnnex/DarellbandpassFilter.m
@@ -0,0 +1,20 @@
+function output_y = DarellbandpassFilter(y,Fs,LOW,MED,HIGH)
+    Len = length(y);
+    F = Fs * (-Len/2 : (Len/2 - 1))/Len ;
+    Mod_Freq = fftshift(fft(y));
+    lenf = length(F);
+    output =  0 .* Mod_Freq; % zero array of len f
+    
+    for n = 1:lenf
+        if ((LOW < abs(F(n))) && HIGH > abs(F(n)))
+            output(n) = 1;
+        else
+            output(n) = 0;
+        end
+    end
+        
+    filtered_Mod_Freq = fftshift(Mod_Freq .* output);
+    
+    output_y = real(ifft(filtered_Mod_Freq));
+    
+end
\ No newline at end of file
diff --git a/src/Main_test.m b/src/Main_test.m
index 259df39..895ca53 100644
--- a/src/Main_test.m
+++ b/src/Main_test.m
@@ -33,3 +33,4 @@ x = DarellPitchEnvelope(x, fs, attack,decay,sustain,release); %output new sound
 %play over 5 counts, should only hear 200hz
 playtime = 5;
 play_continuous(x, fs, playtime)
+