diff --git a/DarellsAnnex/app.mlapp b/DarellsAnnex/app.mlapp
index 78314e0..bd7b703 100644
Binary files a/DarellsAnnex/app.mlapp and b/DarellsAnnex/app.mlapp differ
diff --git a/src/AmpEnvelopeSelect.m b/src/AmpEnvelopeSelect.m
new file mode 100644
index 0000000..1492f51
--- /dev/null
+++ b/src/AmpEnvelopeSelect.m
@@ -0,0 +1,8 @@
+function output = AmpEnvelopeSelect(input, Fs, attack,decay,sustain,release,number)
+    if(number == "Option 1")
+        output = DarellAmplitudeEnvelope(input, Fs, attack,decay,sustain,release);
+    else
+        output = input;
+    end
+end 
+
diff --git a/src/DarellbandpassFilter.m b/src/DarellbandpassFilter.m
index 918358a..fd23c4b 100644
--- a/src/DarellbandpassFilter.m
+++ b/src/DarellbandpassFilter.m
@@ -3,7 +3,7 @@ function output_y = DarellbandpassFilter(y,Fs,LOW,MED,HIGH)
     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
+    output =  zeros([1,lenf]); % zero array of size Mod_freq
     
     for n = 1:lenf
         if ((LOW < abs(F(n))) && HIGH > abs(F(n)))
@@ -14,7 +14,6 @@ function output_y = DarellbandpassFilter(y,Fs,LOW,MED,HIGH)
     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/PitchEnvelopeSelect.m b/src/PitchEnvelopeSelect.m
new file mode 100644
index 0000000..1cbe9d8
--- /dev/null
+++ b/src/PitchEnvelopeSelect.m
@@ -0,0 +1,8 @@
+function output = PitchEnvelopeSelect(input, Fs, attack,decay,sustain,release,number)
+    if(number == "Option 1")
+        output = DarellAmplitudeEnvelope(input, Fs, attack,decay,sustain,release);
+    else
+        output = input;
+    end
+end 
+