diff --git a/games/THE BROKEN SEAL/recon/en/main/08092878.c b/games/THE BROKEN SEAL/recon/en/main/08092878.c
index 00e00646a..09714b9a0 100644
--- a/games/THE BROKEN SEAL/recon/en/main/08092878.c	
+++ b/games/THE BROKEN SEAL/recon/en/main/08092878.c	
@@ -1,9 +1,19 @@
 #include "TYPES.H"
 #include "FIXED_MATH.H"
 
-#define FIELD(base, type, offset) (*(type)((u8 *)(base) + (offset)))
+struct ObjectPairPosition {
+    u8 unknown_00[6];
+    s16 angle;
+    s32 x;
+    s32 y;
+    s32 z;
+};
 
-void ObjectLink_RotatePairToward(void *source, void *target)
+s32 ArcTan2(s32, s32);
+s32 WaitFrames(s32);
+
+void ObjectLink_RotatePairToward(struct ObjectPairPosition *source,
+                                 struct ObjectPairPosition *target)
 {
     s32 source_angle_delta;
     s32 target_angle_delta;
@@ -15,13 +25,11 @@ void ObjectLink_RotatePairToward(void *source, void *target)
     u32 source_angle_target;
 
     if (source != 0 && target != 0) {
-        source_angle_target = (u16)ArcTan2(
-            FIELD(target, s32 *, 0x10) - FIELD(source, s32 *, 0x10),
-            FIELD(target, s32 *, 8) - FIELD(source, s32 *, 8));
+        source_angle_target = (u16)ArcTan2(target->z - source->z, target->x - source->x);
         target_angle = source_angle_target + 0x8000;
         counter = 0;
 loop:
-        source_angle = FIELD(source, u16 *, 6);
+        source_angle = source->angle;
         source_angle_delta = (s16)(source_angle_target - source_angle);
         remaining = 2;
         if (source_angle_delta != 0) {
@@ -29,19 +37,19 @@ void ObjectLink_RotatePairToward(void *source, void *target)
                 source_angle_delta = 0x1000;
             if (source_angle_delta < -0x1000)
                 source_angle_delta = -0x1000;
-            FIELD(source, u16 *, 6) = source_angle + source_angle_delta;
+            source->angle = source_angle + source_angle_delta;
         } else {
             remaining = 1;
         }
 
-        target_angle_current = FIELD(target, u16 *, 6);
+        target_angle_current = target->angle;
         target_angle_delta = (s16)(target_angle - target_angle_current);
         if (target_angle_delta != 0) {
             if (target_angle_delta > 0x1000)
                 target_angle_delta = 0x1000;
             if (target_angle_delta < -0x1000)
                 target_angle_delta = -0x1000;
-            FIELD(target, u16 *, 6) = target_angle_current + target_angle_delta;
+            target->angle = target_angle_current + target_angle_delta;
         } else {
             remaining--;
         }
diff --git a/games/THE BROKEN SEAL/recon/en/main/080fa514.c b/games/THE BROKEN SEAL/recon/en/main/080fa514.c
index a614171b9..97dbd61e1 100644
--- a/games/THE BROKEN SEAL/recon/en/main/080fa514.c	
+++ b/games/THE BROKEN SEAL/recon/en/main/080fa514.c	
@@ -1,41 +1,40 @@
-#include "AUDIO_ENGINE_SYMBOLS.H"
-#include "TYPES.H"
+#include "AUDIO_ENGINE.H"
 
 #define MusicPlayer_ResetActiveTracks Func_080fa514
 
-void AudioCommand_InvokeSlot35(u8 *track);
+void AudioCommand_InvokeSlot35(void *block);
 
 static __inline__ s32 masked_track_status(s32 mask, s32 status)
 {
     return mask & status;
 }
 
-void MusicPlayer_ResetActiveTracks(u8 *player)
+void MusicPlayer_ResetActiveTracks(struct SoundPlayer *player)
 {
-    s32 count = player[8];
-    u8 *track = *(u8 **)(player + 44);
+    s32 count = player->track_count;
+    struct SoundTrack *track = player->tracks;
 
     if (count > 0) {
         s32 active_mask = 0x80;
 
         do {
             register s32 playing_mask;
-            s32 status = track[0];
+            s32 status = track->flags;
 
             if (masked_track_status(active_mask, status) != 0) {
                 playing_mask = 0x40;
 
                 if (masked_track_status(playing_mask, status) != 0) {
                     AudioCommand_InvokeSlot35(track);
-                    track[0] = active_mask;
-                    track[15] = 2;
-                    track[19] = playing_mask;
-                    track[25] = 22;
-                    track[36] = 1;
+                    track->flags = active_mask;
+                    track->bend_range = 2;
+                    track->volume_scale = playing_mask;
+                    track->lfo_speed = 22;
+                    track->voice.kind = 1;
                 }
             }
             count--;
-            track += 80;
+            track++;
         } while (count > 0);
     }
 }
diff --git a/games/THE BROKEN SEAL/recon/en/overlays/advance_effect_motion.c b/games/THE BROKEN SEAL/recon/en/overlays/advance_effect_motion.c
new file mode 100644
index 000000000..03b3960bc
--- /dev/null
+++ b/games/THE BROKEN SEAL/recon/en/overlays/advance_effect_motion.c	
@@ -0,0 +1,29 @@
+#include "TYPES.H"
+#include "FIELD_EFFECT.H"
+
+/*
+ * Ordinary spelling of the five overlay copies of main:0809a65c
+ * (ParticleEffect_UpdateMotionAndScale). Those copies still sit in area
+ * modules behind a do { } while (0) load-order barrier. Recheck them from
+ * this text with __divsi3 bound to each overlay's divide veneer:
+ *   resource_3b2:02000da4
+ *   resource_3c5:02000cf0
+ *   resource_396:0200185c
+ *   resource_3c4:02001068
+ *   resource_3c8:0200096c
+ * Withdraw rather than keep the barrier if this does not match.
+ */
+
+void ParticleEffect_UpdateMotionAndScale(union FieldObject *object)
+{
+    struct FieldEffect *effect = &object->effect;
+
+    effect->x += effect->velocity_x;
+    effect->y += effect->velocity_y;
+    effect->z += effect->velocity_z;
+    effect->velocity_x -= effect->velocity_x / 18;
+    effect->velocity_z -= effect->velocity_z / 16;
+    effect->scale_x += effect->scale_rate_x;
+    effect->scale_y += effect->scale_rate_y;
+    effect->sprite->rotation += effect->spin;
+}
diff --git a/games/THE BROKEN SEAL/recon/en/overlays/effect_move.c b/games/THE BROKEN SEAL/recon/en/overlays/effect_move.c
new file mode 100644
index 000000000..811391425
--- /dev/null
+++ b/games/THE BROKEN SEAL/recon/en/overlays/effect_move.c	
@@ -0,0 +1,21 @@
+#include "TYPES.H"
+#include "FIELD_EFFECT.H"
+
+/*
+ * Shared per-frame effect integrator. Lunpa already compiles this as
+ * Effect_Move. Overlay listings keep the same 54 instruction bytes after
+ * AlchemyC_020000a0 for:
+ *   resource_382, 387, 396, 39b, 39c, 39e, 3a0, 3a5, 3a6, 3b3, 3be, 3c0, 3c9
+ * Adopt as one translation unit with instances; 54-byte function then
+ * two-byte alignment, same as runpa-mura-effect.
+ */
+
+void Effect_Move(union FieldObject *object)
+{
+    object->effect.x += object->effect.velocity_x;
+    object->effect.y += object->effect.velocity_y;
+    object->effect.z += object->effect.velocity_z;
+    object->effect.scale_x += object->effect.scale_rate_x;
+    object->effect.scale_y += object->effect.scale_rate_y;
+    object->effect.sprite->rotation += object->effect.spin;
+}