diff --git a/common/board/io4.c b/common/board/io4.c
index 8001457..d8a5c33 100644
--- a/common/board/io4.c
+++ b/common/board/io4.c
@@ -241,13 +241,21 @@ static HRESULT io4_handle_write(struct irp *irp)
         return S_OK;
 
     case IO4_CMD_SET_PWM_OUTPUT:
-        dprintf("USB I/O: PWM Out\n");
+        // dprintf("USB I/O: PWM Out\n");
+
+        if (io4_ops->write_pwm != NULL) {
+            return io4_ops->write_pwm(out.payload, IO4_REPORT_OUT_PAYLOAD_LEN);
+        }
 
         return S_OK;
 
     case IO4_CMD_SET_UNIQUE_OUTPUT:
         // dprintf("USB I/O: Unique Out\n");
 
+        if (io4_ops->write_unique != NULL) {
+            return io4_ops->write_unique(out.payload, IO4_REPORT_OUT_PAYLOAD_LEN);
+        }
+
         return S_OK;
 
     case IO4_CMD_UPDATE_FIRMWARE:
diff --git a/common/board/io4.h b/common/board/io4.h
index 1f93cf1..db83219 100644
--- a/common/board/io4.h
+++ b/common/board/io4.h
@@ -30,6 +30,8 @@ struct io4_ops {
     HRESULT (*poll)(void* ctx, struct io4_state* state);
 
     HRESULT (*write_gpio)(uint8_t* payload, size_t len);
+    HRESULT (*write_pwm)(uint8_t* payload, size_t len);
+    HRESULT (*write_unique)(uint8_t* payload, size_t len);
 };
 
 HRESULT io4_hook_init(
diff --git a/common/board/led15070.c b/common/board/led15070.c
index 43a015d..1cd9be5 100644
--- a/common/board/led15070.c
+++ b/common/board/led15070.c
@@ -71,6 +71,7 @@ static uint16_t led15070_fw_sum;
 static uint8_t led15070_host_adr = 0x01;
 
 #define led15070_nboards 2
+#define led15070_nleds 32
 
 typedef struct {
     CRITICAL_SECTION lock;
@@ -79,8 +80,10 @@ typedef struct {
     struct uart boarduart;
     uint8_t written_bytes[520];
     uint8_t readable_bytes[520];
-    uint8_t gs[32][4];
-    uint8_t dc[32][3];
+    uint8_t gs[led15070_nleds][4];
+    uint8_t gs_fade[led15070_nleds][4];
+    bool gs_fade_pending[led15070_nleds];
+    uint8_t dc[led15070_nleds][3];
     uint8_t fet[3];
     uint8_t gs_palette[8][3];
     wchar_t eeprom_path[MAX_PATH];
@@ -150,6 +153,8 @@ HRESULT led15070_hook_init(
         v->boarduart.readable.nbytes = sizeof(v->readable_bytes);
 
         memset(v->gs, 0, sizeof(v->gs));
+        memset(v->gs_fade, 0, sizeof(v->gs_fade));
+        memset(v->gs_fade_pending, 0, sizeof(v->gs_fade_pending));
         memset(v->dc, 0, sizeof(v->dc));
         memset(v->fet, 0, sizeof(v->fet));
         memset(v->gs_palette, 0, sizeof(v->gs_palette));
@@ -454,6 +459,8 @@ static HRESULT led15070_req_set_normal_8bit(int board, const struct led15070_req
     led15070_per_board_vars[board].gs[idx][0] = req->payload[1]; // R
     led15070_per_board_vars[board].gs[idx][1] = req->payload[2]; // G
     led15070_per_board_vars[board].gs[idx][2] = req->payload[3]; // B
+    led15070_per_board_vars[board].gs[idx][3] = 0;
+    led15070_per_board_vars[board].gs_fade_pending[idx] = false;
 
     if (!led15070_per_board_vars[board].enable_response)
         return S_OK;
@@ -473,31 +480,65 @@ static HRESULT led15070_req_set_normal_8bit(int board, const struct led15070_req
     return led15070_frame_encode(&led15070_per_board_vars[board].boarduart.readable, &resp, sizeof(resp.hdr) + resp.hdr.nbytes);
 }
 
+static void led15070_calc_range(
+        uint8_t start,
+        uint8_t count,
+        uint8_t skip,
+        uint8_t *out_start,
+        uint8_t *out_end)
+{
+    uint16_t s = start;
+    uint16_t c = count;
+
+    if (c == 0) {
+        *out_start = 0;
+        *out_end = 0;
+        return;
+    }
+
+    if (c >= led15070_nleds) {
+        c = led15070_nleds;
+    }
+
+    if (skip > 0 && skip <= c) {
+        s += skip;
+        c -= skip;
+    }
+
+    if (s >= led15070_nleds || c == 0) {
+        *out_start = led15070_nleds;
+        *out_end = led15070_nleds;
+        return;
+    }
+
+    *out_start = (uint8_t) s;
+    *out_end = (s + c > led15070_nleds) ? led15070_nleds : (uint8_t) (s + c);
+}
+
 static HRESULT led15070_req_set_multi_flash_8bit(int board, const struct led15070_req_any *req)
 {
     uint8_t idx_start = req->payload[0];
-    uint8_t idx_end = req->payload[1];
+    uint8_t idx_count = req->payload[1];
     uint8_t idx_skip = req->payload[2];
+    uint8_t start;
+    uint8_t end;
 
     // TODO: useful?
 #if defined(LOG_LED15070)
-    dprintf("LED 15070: Set LED - Multi flash 8bit (board %u, start %u, end %u, skip %u)\n",
-           board, idx_start, idx_end, idx_skip);
+    dprintf("LED 15070: Set LED - Multi flash 8bit (board %u, start %u, count %u, skip %u)\n",
+           board, idx_start, idx_count, idx_skip);
 #endif
 
-    if (idx_skip > 0 && idx_skip <= (idx_end - idx_start + 1)) {
-        idx_start += idx_skip;
-    }
+    led15070_calc_range(idx_start, idx_count, idx_skip, &start, &end);
 
-    int i = idx_start;
-    do {
+    for (int i = start; i < end; i++) {
         led15070_per_board_vars[board].gs[i][0] = req->payload[3]; // R
         led15070_per_board_vars[board].gs[i][1] = req->payload[4]; // G
         led15070_per_board_vars[board].gs[i][2] = req->payload[5]; // B
         /* Always 0, tells the controller to immediately change to this color */
         led15070_per_board_vars[board].gs[i][3] = req->payload[6]; // Speed
-        i++;
-    } while (i < idx_end);
+        led15070_per_board_vars[board].gs_fade_pending[i] = false;
+    }
 
     if (!led15070_per_board_vars[board].enable_response)
         return S_OK;
@@ -520,25 +561,24 @@ static HRESULT led15070_req_set_multi_flash_8bit(int board, const struct led1507
 static HRESULT led15070_req_set_multi_fade_8bit(int board, const struct led15070_req_any *req)
 {
     uint8_t idx_start = req->payload[0];
-    uint8_t idx_end = req->payload[1];
+    uint8_t idx_count = req->payload[1];
     uint8_t idx_skip = req->payload[2];
+    uint8_t start;
+    uint8_t end;
 #if defined(LOG_LED15070)
-    dprintf("LED 15070: Set LED - Multi fade 8bit (board %u, start %u, end %u, skip %u)\n",
-           board, idx_start, idx_end, idx_skip);
+    dprintf("LED 15070: Set LED - Multi fade 8bit (board %u, start %u, count %u, skip %u)\n",
+           board, idx_start, idx_count, idx_skip);
 #endif
 
-    if (idx_skip > 0 && idx_skip <= (idx_end - idx_start + 1)) {
-        idx_start += idx_skip;
-    }
+    led15070_calc_range(idx_start, idx_count, idx_skip, &start, &end);
 
-    int i = idx_start;
-    do {
-        led15070_per_board_vars[board].gs[i][0] = req->payload[3]; // R
-        led15070_per_board_vars[board].gs[i][1] = req->payload[4]; // G
-        led15070_per_board_vars[board].gs[i][2] = req->payload[5]; // B
-        led15070_per_board_vars[board].gs[i][3] = req->payload[6]; // Speed
-        i++;
-    } while (i < idx_end);
+    for (int i = start; i < end; i++) {
+        led15070_per_board_vars[board].gs_fade[i][0] = req->payload[3]; // R
+        led15070_per_board_vars[board].gs_fade[i][1] = req->payload[4]; // G
+        led15070_per_board_vars[board].gs_fade[i][2] = req->payload[5]; // B
+        led15070_per_board_vars[board].gs_fade[i][3] = req->payload[6]; // Speed
+        led15070_per_board_vars[board].gs_fade_pending[i] = true;
+    }
 
     if (!led15070_per_board_vars[board].enable_response)
         return S_OK;
@@ -767,12 +807,56 @@ static HRESULT led15070_req_dc_update(int board, const struct led15070_req_any *
 
 static HRESULT led15070_req_gs_update(int board, const struct led15070_req_any *req)
 {
+    _led15070_per_board_vars *v = &led15070_per_board_vars[board];
 #if defined(LOG_LED15070)
     dprintf("LED 15070: GS update (board %u)\n", board);
 #endif
 
-    if (led_gs_update)
-        led_gs_update(board, (const uint8_t*)led15070_per_board_vars[board].gs);
+    if (led_gs_update) {
+        bool has_fade = false;
+        uint8_t payload[led15070_nleds][4];
+
+        for (int i = 0; i < led15070_nleds; i++) {
+            if (v->gs_fade_pending[i]) {
+                has_fade = true;
+                break;
+            }
+        }
+
+        if (has_fade) {
+            for (int i = 0; i < led15070_nleds; i++) {
+                payload[i][0] = v->gs[i][0];
+                payload[i][1] = v->gs[i][1];
+                payload[i][2] = v->gs[i][2];
+                payload[i][3] = 0;
+            }
+
+            led_gs_update(board, (const uint8_t*)payload);
+
+            for (int i = 0; i < led15070_nleds; i++) {
+                if (v->gs_fade_pending[i]) {
+                    payload[i][0] = v->gs_fade[i][0];
+                    payload[i][1] = v->gs_fade[i][1];
+                    payload[i][2] = v->gs_fade[i][2];
+                    payload[i][3] = v->gs_fade[i][3];
+                    v->gs_fade_pending[i] = false;
+                } else {
+                    payload[i][0] = v->gs[i][0];
+                    payload[i][1] = v->gs[i][1];
+                    payload[i][2] = v->gs[i][2];
+                    payload[i][3] = v->gs[i][3];
+                }
+            }
+
+            led_gs_update(board, (const uint8_t*)payload);
+        } else {
+            led_gs_update(board, (const uint8_t*)v->gs);
+        }
+    } else {
+        for (int i = 0; i < led15070_nleds; i++) {
+            v->gs_fade_pending[i] = false;
+        }
+    }
 
     if (!led15070_per_board_vars[board].enable_response)
         return S_OK;
diff --git a/games/mai2hook/io4.c b/games/mai2hook/io4.c
index cb0b38d..a1903d2 100644
--- a/games/mai2hook/io4.c
+++ b/games/mai2hook/io4.c
@@ -11,11 +11,17 @@
 #include "util/dprintf.h"
 
 static HRESULT mai2_io4_poll(void* ctx, struct io4_state* state);
+static HRESULT mai2_io4_write_gpio(uint8_t* payload, size_t len);
+static HRESULT mai2_io4_write_pwm(uint8_t* payload, size_t len);
+static HRESULT mai2_io4_write_unique(uint8_t* payload, size_t len);
 
 static uint16_t coins;
 
 static const struct io4_ops mai2_io4_ops = {
     .poll = mai2_io4_poll,
+    .write_gpio = mai2_io4_write_gpio,
+    .write_pwm = mai2_io4_write_pwm,
+    .write_unique = mai2_io4_write_unique,
 };
 
 HRESULT mai2_io4_hook_init(const struct io4_config* cfg) {
@@ -148,5 +154,62 @@ static HRESULT mai2_io4_poll(void* ctx, struct io4_state* state) {
         state->buttons[1] |= 1 << 4;
     }
 
+    return S_OK;
+}
+
+static HRESULT mai2_io4_write_gpio(uint8_t* payload, size_t len) {
+    if (len >= 4) {
+        char bin0[9];
+        char bin1[9];
+        for (int i = 0; i < 8; i++) {
+            bin0[7 - i] = (payload[0] & (1 << i)) ? '1' : '0';
+            bin1[7 - i] = (payload[1] & (1 << i)) ? '1' : '0';
+        }
+        bin0[8] = '\0';
+        bin1[8] = '\0';
+
+#if defined(LOG_IO4)
+        dprintf("IO4 LED: [%02X %02X %02X %02X] (Byte0: %s, Byte1: %s)\n", 
+            payload[0], payload[1], payload[2], payload[3], bin0, bin1);
+
+        dprintf("  1P Code Reader: %s\n", (payload[0] & 0x20) ? "ON" : "OFF");
+        dprintf("  2P Code Reader: %s\n", (payload[0] & 0x04) ? "ON" : "OFF");
+        dprintf("  Camera Ring:    %s\n", (payload[1] & 0x80) ? "ON" : "OFF");
+        dprintf("  Camera Rec:     %s\n", (payload[1] & 0x40) ? "ON" : "OFF");
+#endif
+    }
+    return S_OK;
+}
+
+static HRESULT mai2_io4_write_pwm(uint8_t* payload, size_t len) {
+    if (len >= 16) {
+#if defined(LOG_IO4)
+        dprintf("IO4 PWM: %02X %02X %02X %02X %02X %02X %02X %02X ...\n", 
+            payload[0], payload[1], payload[2], payload[3],
+            payload[4], payload[5], payload[6], payload[7]);
+#endif
+    }
+    return S_OK;
+}
+
+static HRESULT mai2_io4_write_unique(uint8_t* payload, size_t len) {
+    if (len < 8) {
+        return S_OK;
+    }
+
+#if defined(LOG_IO4)
+    dprintf("IO4 Unique: %02X %02X %02X %02X %02X %02X %02X %02X ...\n", 
+        payload[0], payload[1], payload[2], payload[3],
+        payload[4], payload[5], payload[6], payload[7]);
+#endif
+
+    if (mai2_dll.led_set_leds) {
+        uint8_t rgb_1p[3] = { payload[2], payload[4], payload[6] };
+        uint8_t rgb_2p[3] = { payload[3], payload[5], payload[7] };
+
+        mai2_dll.led_set_leds(0, rgb_1p);
+        mai2_dll.led_set_leds(1, rgb_2p);
+    }
+
     return S_OK;
 }
\ No newline at end of file
diff --git a/games/mai2hook/mai2-dll.c b/games/mai2hook/mai2-dll.c
index 121750e..9fa591d 100644
--- a/games/mai2hook/mai2-dll.c
+++ b/games/mai2hook/mai2-dll.c
@@ -8,6 +8,11 @@
 #include "util/dll-bind.h"
 #include "util/dprintf.h"
 
+enum {
+    MAI2_DLL_SYM_COUNT_V101 = 11,
+    MAI2_DLL_SYM_COUNT_V102 = 12,
+};
+
 const struct dll_bind_sym mai2_dll_syms[] = {
     {
         .sym = "mai2_io_init",
@@ -42,6 +47,9 @@ const struct dll_bind_sym mai2_dll_syms[] = {
     }, {
         .sym = "mai2_io_led_gs_update",
         .off = offsetof(struct mai2_dll, led_gs_update),
+    }, {
+        .sym = "mai2_io_led_billboard_set",
+        .off = offsetof(struct mai2_dll, led_set_leds),
     },
 };
 
@@ -60,6 +68,7 @@ HRESULT mai2_dll_init(const struct mai2_dll_config *cfg, HINSTANCE self)
     HINSTANCE owned;
     HINSTANCE src;
     HRESULT hr;
+    size_t sym_count;
 
     assert(cfg != NULL);
     assert(self != NULL);
@@ -104,7 +113,11 @@ HRESULT mai2_dll_init(const struct mai2_dll_config *cfg, HINSTANCE self)
     }
 
     sym = mai2_dll_syms;
-    hr = dll_bind(&mai2_dll, src, &sym, _countof(mai2_dll_syms));
+    sym_count = (mai2_dll.api_version < 0x0102)
+            ? MAI2_DLL_SYM_COUNT_V101
+            : MAI2_DLL_SYM_COUNT_V102;
+
+    hr = dll_bind(&mai2_dll, src, &sym, sym_count);
 
     if (FAILED(hr)) {
         if (src != self) {
diff --git a/games/mai2hook/mai2-dll.h b/games/mai2hook/mai2-dll.h
index 599d44a..ac456e8 100644
--- a/games/mai2hook/mai2-dll.h
+++ b/games/mai2hook/mai2-dll.h
@@ -17,6 +17,7 @@ struct mai2_dll {
     void (*led_set_fet_output)(uint8_t board, const uint8_t *rgb);
     void (*led_dc_update)(uint8_t board, const uint8_t *rgb);
     void (*led_gs_update)(uint8_t board, const uint8_t *rgb);
+    void (*led_set_leds)(uint8_t board, const uint8_t *rgb);
 };
 
 struct mai2_dll_config {
diff --git a/games/mai2hook/mai2hook.def b/games/mai2hook/mai2hook.def
index 50e4058..a3b3df8 100644
--- a/games/mai2hook/mai2hook.def
+++ b/games/mai2hook/mai2hook.def
@@ -23,3 +23,4 @@ EXPORTS
     mai2_io_led_set_fet_output
     mai2_io_led_dc_update
     mai2_io_led_gs_update
+    mai2_io_led_billboard_set
diff --git a/games/mai2io/mai2io.c b/games/mai2io/mai2io.c
index 57404cb..4864887 100644
--- a/games/mai2io/mai2io.c
+++ b/games/mai2io/mai2io.c
@@ -19,7 +19,7 @@ static bool mai2_io_touch_1p_stop_flag;
 static HANDLE mai2_io_touch_2p_thread;
 static bool mai2_io_touch_2p_stop_flag;
 
-uint16_t mai2_io_get_api_version(void) { return 0x0101; }
+uint16_t mai2_io_get_api_version(void) { return 0x0102; }
 
 HRESULT mai2_io_init(void) {
     mai2_io_config_load(&mai2_io_cfg, get_config_path());
@@ -265,3 +265,11 @@ void mai2_io_led_gs_update(uint8_t board, const uint8_t *rgb) {
 #endif
     return;
 }
+
+void mai2_io_led_billboard_set(uint8_t board, const uint8_t *rgb) {
+#if 0
+    uint8_t player = board + 1;
+    dprintf("Mai2 LED %dP: Billboard set R:%02X G:%02X B:%02X\n", player, rgb[0], rgb[1], rgb[2]);
+#endif
+    return;
+}
diff --git a/games/mai2io/mai2io.h b/games/mai2io/mai2io.h
index 9c0a7f0..4519a01 100644
--- a/games/mai2io/mai2io.h
+++ b/games/mai2io/mai2io.h
@@ -28,7 +28,7 @@ enum {
    the major version and the low byte is the minor version (as defined by the
    Semantic Versioning standard).
 
-   The latest API version as of this writing is 0x0100. */
+   The latest API version as of this writing is 0x0102. */
 
 uint16_t mai2_io_get_api_version(void);
 
@@ -190,3 +190,12 @@ void mai2_io_led_dc_update(uint8_t board, const uint8_t *rgb);
    Minimum API version: 0x0101 */
 
 void mai2_io_led_gs_update(uint8_t board, const uint8_t *rgb);
+
+/* Update the Billboard LEDs. rgb is a pointer to an array.
+
+   maimai DX uses two boards. Board 0 is for the player 1 side (left) and board 1
+   is for the player 2 side (right).
+
+   Minimum API version: 0x0102 */
+
+void mai2_io_led_billboard_set(uint8_t board, const uint8_t *rgb);