diff --git a/engine.c b/engine.c
index ef7f4f2..cf4a0a4 100644
--- a/engine.c
+++ b/engine.c
@@ -138,7 +138,8 @@ static int process_callback(jack_nframes_t nframes, void *arg) {
         }
         
         for (jack_nframes_t i = 0; i < nframes; i++) {
-            rack_in[i] = 0.0f;
+            // Start with live audio input
+            rack_in[i] = audio_in[ch][i];
             
             for (int s = 0; s < MAX_SCENES; s++) {
                 // Iterate over all grids for this scene and channel