diff --git a/src/graphics.cpp b/src/graphics.cpp
index 213d03d..d517364 100644
--- a/src/graphics.cpp
+++ b/src/graphics.cpp
@@ -561,13 +561,116 @@ void transfer_middle_line(ta_parameter_writer& writer, float x, float y)
               0x202020);
 }
 
+static inline int round_up_div(int n, int m)
+{
+  int div = n / m;
+  int rem = n % m;
+  if (rem == 0)
+    return div;
+  return div + 1;
+}
+
+static inline int round_up(int n, int m)
+{
+  int rem = n % m;
+  if (rem == 0)
+    return n;
+  return n + m - rem;
+}
+
+void transfer_rectangle(ta_parameter_writer& writer,
+                        float x, float y, float z,
+                        float width, float height,
+                        uint32_t base_color)
+{
+  quad_type_0(writer,
+              {x + 0, y + 0, z},
+              {x + width, y + 0, z},
+              {x + width, y + height, z},
+              {x + 0, y + height, z},
+              base_color);
+}
+
+void transfer_channel_status(ta_parameter_writer& writer, int x, int y)
+{
+  using namespace interpreter;
+
+  const int channel_status_height = 50;
+
+  int max_channels_per_row = framebuffer.px_width / 40;
+  int rows = round_up_div(state.xm.number_of_channels, max_channels_per_row);
+  assert(rows > 0);
+  int number_of_channels = round_up(state.xm.number_of_channels, rows);
+  int channels_per_row = number_of_channels / rows;
+  int width_per_col = (framebuffer.px_width - 3) / channels_per_row;
+  int offset = (framebuffer.px_width - (width_per_col * channels_per_row)) / 2;
+
+  int inner_width = width_per_col - 3;
+
+  int height_per_row = channel_status_height / rows;
+  int vert_center = height_per_row / 2 - glyph_vert_advance / 2;
+
+  int ch = 0;
+  for (int row = 0; row < rows; row++) {
+    int xi = x + offset - 2;
+
+    global_polygon_untextured(writer,
+                              para_control::list_type::opaque,
+                              tsp_instruction_word::dst_alpha_instr::zero);
+
+    transfer_horizontal_border(writer, xi, y, width_per_col * channels_per_row);
+
+    for (int col = 0; col < channels_per_row; col++) {
+
+      global_polygon_untextured(writer,
+                                para_control::list_type::opaque,
+                                tsp_instruction_word::dst_alpha_instr::zero);
+
+      transfer_vertical_border(writer, xi, y, height_per_row);
+
+      int keyon = 128 * (state.channel[ch].keyon - 224) / 16;
+      if (keyon < 0) keyon = 0;
+      uint32_t base_color = (keyon << 16) | (keyon << 8) | (keyon << 0);
+      transfer_rectangle(writer,
+                         xi, y, 1.0 / 10000.0,
+                         width_per_col, height_per_row,
+                         base_color);
+
+      if (ch < state.xm.number_of_channels) {
+        global_polygon_textured(writer,
+                                para_control::list_type::opaque);
+
+        int hori_center = inner_width / 2 - (glyph_hori_advance * (ch >= 10)) / 2;
+        transfer_integer(writer, ch, xi + hori_center, y + vert_center,
+                         0, 0,
+                         0xa7a7a7);
+      }
+
+      xi += width_per_col;
+      ch += 1;
+    }
+
+    global_polygon_untextured(writer,
+                              para_control::list_type::opaque,
+                              tsp_instruction_word::dst_alpha_instr::zero);
+
+    transfer_vertical_border(writer, xi, y, height_per_row);
+
+    y += height_per_row;
+  }
+
+  int xi = x + offset - 2;
+  transfer_horizontal_border(writer, xi, y, width_per_col * channels_per_row);
+}
+
 void transfer_scene(ta_parameter_writer& writer)
 {
   const int x = 3;
-  const int y = 48;
+  const int y = 100;
 
   { // punch-through
-    global_polygon_textured(writer);
+    global_polygon_textured(writer,
+                            para_control::list_type::punch_through);
 
     transfer_lines(writer, x, y);
 
@@ -593,6 +696,8 @@ void transfer_scene(ta_parameter_writer& writer)
 
     transfer_borders(writer, x, y);
 
+    transfer_channel_status(writer, 0, 0);
+
     writer.append<ta_global_parameter::end_of_list>() =
       ta_global_parameter::end_of_list(para_control::para_type::end_of_list);
   }
diff --git a/src/interpreter.cpp b/src/interpreter.cpp
index b20916c..a7c4022 100644
--- a/src/interpreter.cpp
+++ b/src/interpreter.cpp
@@ -113,7 +113,7 @@ void _play_note(int ch, const xm_pattern_format_t * pf)
     wait(); aica_sound.channel[ch].PLFOS(0);
   }
 
-  state.channel[ch].keyon = 1;
+  state.channel[ch].keyon = 255;
   wait(); aica_sound.channel[ch].KYONB(0);
 }
 
@@ -227,9 +227,9 @@ void interrupt()
       break;
     }
     */
-    if (state.channel[ch].keyon != 0) {
+    if (state.channel[ch].keyon == 255) {
       wait(); aica_sound.channel[ch].KYONB(1);
-      state.channel[ch].keyon = 0;
+      state.channel[ch].keyon -= 1;
     }
   }
   wait(); aica_sound.channel[0].KYONEX(1);
@@ -237,6 +237,12 @@ void interrupt()
   if ((state.interrupt_clock % state.tick_rate) != 0) {
     return;
   }
+  for (int ch = 0; ch < 64; ch++) {
+    int keyon = state.channel[ch].keyon;
+    if (keyon != 255 && keyon != 0) {
+      state.channel[ch].keyon -= 1;
+    }
+  }
 
   int tick = state.tick % state.ticks_per_line;
   bool note_tick = tick == 0;
diff --git a/src/ta_parameter.hpp b/src/ta_parameter.hpp
index c71b965..a91d454 100644
--- a/src/ta_parameter.hpp
+++ b/src/ta_parameter.hpp
@@ -1,12 +1,12 @@
-void global_polygon_textured(ta_parameter_writer& writer)
+void global_polygon_textured(ta_parameter_writer& writer, uint32_t list_type)
 {
   const uint32_t parameter_control_word = para_control::para_type::polygon_or_modifier_volume
-                                        | para_control::list_type::punch_through
+                                        | list_type
                                         | obj_control::col_type::packed_color
                                         | obj_control::texture
                                         ;
 
-  const uint32_t isp_tsp_instruction_word = isp_tsp_instruction_word::depth_compare_mode::greater
+  const uint32_t isp_tsp_instruction_word = isp_tsp_instruction_word::depth_compare_mode::greater_or_equal
                                           | isp_tsp_instruction_word::culling_mode::no_culling;
 
   const uint32_t tsp_instruction_word = tsp_instruction_word::texture_shading_instruction::modulate
@@ -39,7 +39,7 @@ void global_polygon_untextured(ta_parameter_writer& writer, uint32_t list_type,
                                         | obj_control::col_type::packed_color
                                         ;
 
-  const uint32_t isp_tsp_instruction_word = isp_tsp_instruction_word::depth_compare_mode::greater
+  const uint32_t isp_tsp_instruction_word = isp_tsp_instruction_word::depth_compare_mode::greater_or_equal
                                           | isp_tsp_instruction_word::culling_mode::no_culling;
 
   const uint32_t tsp_instruction_word = tsp_instruction_word::texture_shading_instruction::modulate