diff --git a/gui.c b/gui.c
index 5b00977..f94320b 100644
--- a/gui.c
+++ b/gui.c
@@ -2,6 +2,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <math.h>
+#include <stdint.h>
 #include <jack/jack.h>
 #include <ncurses.h>
 #include <unistd.h>
@@ -94,21 +95,29 @@ static void gui_update(void)
             }
         }
         if (mu_button(ctx, "Reset")) {
+            Action action = { .type = ACTION_RESET_TRANSPORT };
+            g_engine->dispatch(action);
             current_beat = 0;
         }
         if (mu_button(ctx, "Quit")) {
+            Action action = { .type = ACTION_QUIT };
+            g_engine->dispatch(action);
             running = 0;
         }
 
         /* BPM slider */
         mu_layout_row(ctx, 2, (int[]) { 60, -1 }, 0);
         mu_label(ctx, "BPM:");
-        mu_slider_ex(ctx, &bpm, 20.0f, 300.0f, 0, "%.0f", 0);
+        mu_slider_ex(ctx, &bpm, 20.0f, 300.0f, 0, "%.0f", MU_OPT_ALIGNCENTER);
 
         /* loop length */
         mu_layout_row(ctx, 2, (int[]) { 60, -1 }, 0);
         mu_label(ctx, "Length:");
-        mu_slider_ex(ctx, (float*)&loop_length, 1.0f, 64.0f, 0, "%.0f", 0);
+        {
+            float loop_length_f = (float)loop_length;
+            mu_slider_ex(ctx, &loop_length_f, 1.0f, 64.0f, 0, "%.0f", 0);
+            loop_length = (int)loop_length_f;
+        }
 
         /* beat indicator */
         mu_layout_row(ctx, 1, (int[]) { -1 }, 0);
@@ -123,7 +132,8 @@ static void gui_update(void)
         {
             float progress = (loop_length > 0) ? (float)current_beat / (float)loop_length : 0.0f;
             mu_Rect r = mu_layout_next(ctx);
-            mu_draw_control_frame(ctx, mu_get_id(ctx, &progress, sizeof(progress)), r, MU_COLOR_BASE, 0);
+            mu_Id prog_id = mu_get_id(ctx, &progress, sizeof(progress));
+            mu_draw_control_frame(ctx, prog_id, r, MU_COLOR_BASE, 0);
             if (progress > 0.0f) {
                 mu_Rect fill = r;
                 fill.w = (int)(r.w * progress);
@@ -162,6 +172,8 @@ static void gui_update(void)
             mu_label(ctx, "Level:");
             if (mu_button(ctx, zoom_labels[zoom_level])) {
                 zoom_level = (zoom_level + 1) % 3;
+                zoom_focus_scene = 0;
+                zoom_focus_channel = 0;
             }
             
             mu_layout_row(ctx, 2, (int[]) { 60, -1 }, 0);
@@ -169,9 +181,7 @@ static void gui_update(void)
             {
                 char buf[32];
                 snprintf(buf, sizeof(buf), "%d", zoom_focus_scene + 1);
-                if (mu_button(ctx, buf)) {
-                    /* click to reset? no action needed */
-                }
+                mu_label(ctx, buf);
             }
             
             mu_layout_row(ctx, 2, (int[]) { 60, -1 }, 0);
@@ -179,9 +189,7 @@ static void gui_update(void)
             {
                 char buf[32];
                 snprintf(buf, sizeof(buf), "%d", zoom_focus_channel + 1);
-                if (mu_button(ctx, buf)) {
-                    /* click to reset? no action needed */
-                }
+                mu_label(ctx, buf);
             }
             
             /* Navigation hint */
@@ -204,7 +212,12 @@ static void gui_update(void)
         mu_layout_row(ctx, 1, (int[]) { -1 }, 0);
         if (mu_button(ctx, "Add Plugin")) {
             if (plugin_uri_input_len > 0) {
-                carla_add_plugin(&g_engine->carla_host, selected_channel, plugin_uri_input, PLUGIN_TYPE_INTERNAL);
+                Action action = { .type = ACTION_RACK_ADD_PLUGIN };
+                action.data.rack_add_plugin.channel = selected_channel;
+                strncpy(action.data.rack_add_plugin.uri, plugin_uri_input, sizeof(action.data.rack_add_plugin.uri) - 1);
+                action.data.rack_add_plugin.uri[sizeof(action.data.rack_add_plugin.uri) - 1] = '\0';
+                action.data.rack_add_plugin.type = PLUGIN_TYPE_INTERNAL;
+                g_engine->dispatch(action);
                 plugin_uri_input_len = 0;
                 plugin_uri_input[0] = '\0';
             }
@@ -257,7 +270,12 @@ int gui_main(Engine *engine)
             } else if (ch == '\n' || ch == '\r') {
                 /* Submit plugin URI */
                 if (plugin_uri_input_len > 0) {
-                    carla_add_plugin(&g_engine->carla_host, selected_channel, plugin_uri_input, PLUGIN_TYPE_INTERNAL);
+                    Action action = { .type = ACTION_RACK_ADD_PLUGIN };
+                    action.data.rack_add_plugin.channel = selected_channel;
+                    strncpy(action.data.rack_add_plugin.uri, plugin_uri_input, sizeof(action.data.rack_add_plugin.uri) - 1);
+                    action.data.rack_add_plugin.uri[sizeof(action.data.rack_add_plugin.uri) - 1] = '\0';
+                    action.data.rack_add_plugin.type = PLUGIN_TYPE_INTERNAL;
+                    g_engine->dispatch(action);
                     plugin_uri_input_len = 0;
                     plugin_uri_input[0] = '\0';
                 }
@@ -323,7 +341,8 @@ int gui_main(Engine *engine)
         }
 
         /* update engine state */
-        AppState state = dispatcher_get_state();
+        AppState state;
+        dispatcher_get_state(&state);
         current_beat = state.bar_position * 4 + state.beat_position;
 
         /* render GUI */