diff --git a/main.cpp b/main.cpp
index 06b3425..bc74055 100644
--- a/main.cpp
+++ b/main.cpp
@@ -7,6 +7,7 @@ int main() {
     const int sample_rate = 48000;
     const float freq = 50.0f;
     float phase = 0.0f;
+    int duration = 1;
 
     PipeMini audio;
 
@@ -25,8 +26,8 @@ int main() {
         return 1;
     }
 
-    printf("playing %f Hz sine for 5 seconds...\n", freq);
-    sleep(1);
+    printf("playing %f Hz sine for %d seconds...\n", freq, duration);
+    sleep(duration);
 
     return 0;
 }
diff --git a/pipemini_demo b/pipemini_demo
index ad4b467..45dc9cb 100755
Binary files a/pipemini_demo and b/pipemini_demo differ