diff --git a/src/audio/e0b30_len_b80.c b/src/audio/e0b30_len_b80.c
index 7227476b3a2..58da9278be3 100644
--- a/src/audio/e0b30_len_b80.c
+++ b/src/audio/e0b30_len_b80.c
@@ -4,7 +4,6 @@
 void bgm_update_volume(void);
 void bgm_set_target_volume(s16 volume);
 
-// these are BSS
 SHIFT_BSS s16 MusicDefaultVolume;
 SHIFT_BSS s16 MusicMaxVolume;
 SHIFT_BSS s16 MusicCurrentVolume;
diff --git a/tools/build/yay0/Yay0compress.c b/tools/build/yay0/Yay0compress.c
index 22ffb641210..0dc49ea2a09 100644
--- a/tools/build/yay0/Yay0compress.c
+++ b/tools/build/yay0/Yay0compress.c
@@ -2,315 +2,284 @@
 #include <stdlib.h>
 #include <string.h>
 
-int main(int argc, const char **argv, const char **envp);
-void encode();
-void search(unsigned int a1, int a2, int *a3, unsigned int *a4);
-int mischarsearch(unsigned char *a1, int a2, unsigned char *a3, int a4);
-void initskip(unsigned char *a1, int a2);
-void writeshort(short a1);
-void writeint4(int a1);
-
-unsigned short skip[256]; // idb
-int cp; // weak
-int ndp; // weak
-FILE *fp; // idb
-unsigned char *def;
-unsigned short *pol;
-int pp; // weak
-int insize; // idb
-int ncp; // weak
-int npp; // weak
-unsigned char *bz;
-int dp; // idb
-unsigned int *cmd;
-
-int main(int argc, const char **argv, const char **envp)
-{
-    char src[999];
-	char dest[999];
-
-
-	if (argc < 3)
-	{
-		fprintf(stderr, "Yay0compress [infile] [outfile]\n");
-		return 1;
-	}
-
-	strcpy(src, argv[1]);
+int  main(int argc, const char** argv, const char** envp);
+void encode(FILE* fp, int insize, unsigned char* bz);
+void search(unsigned int a1, int insize, int* a3, unsigned int* a4, unsigned char* bz);
+int  mischarsearch(unsigned char* pattern, int patternlen, unsigned char* data, int datalen);
+void initskip(unsigned short* skip, unsigned char* a1, int a2);
+void writeshort(FILE* fp, short a1);
+void writeint4(FILE* fp, int a1);
+
+int main(int argc, const char** argv, const char** envp) {
+    FILE*          fp; // idb
+    char           src[999];
+    char           dest[999];
+    int            insize; // idb
+    unsigned char* bz;
+
+    if (argc < 3) {
+        fprintf(stderr, "Yay0compress [infile] [outfile]\n");
+        return 1;
+    }
+
+    strcpy(src, argv[1]);
     strcpy(dest, argv[2]);
 
-	if ((fp = fopen(src, "rb")) == NULL)
-	{
-		fprintf(stderr, "FILE OPEN ERROR![%s]\n", src);
-		return 1;
-	}
+    if ((fp = fopen(src, "rb")) == NULL) {
+        fprintf(stderr, "FILE OPEN ERROR![%s]\n", src);
+        return 1;
+    }
 
-	fseek(fp, 0, SEEK_END);
-	insize = ftell(fp);
-	fseek(fp, 0, SEEK_SET);
+    fseek(fp, 0, SEEK_END);
+    insize = ftell(fp);
+    fseek(fp, 0, SEEK_SET);
 
-	bz = malloc(insize);
-	fread(bz, 1, insize, fp);
-	fclose(fp);
+    bz = malloc(insize);
+    fread(bz, 1, insize, fp);
+    fclose(fp);
 
-	for (int i = 0; src[i]; i++)
-	{
-		if (src[i] == '.')
-		{
-			src[i] = 0;
-			break;
-		}
-	}
+    for (int i = 0; src[i]; i++) {
+        if (src[i] == '.') {
+            src[i] = 0;
+            break;
+        }
+    }
 
-	if ((fp = fopen(dest, "wb")) == NULL)
-	{
-		fprintf(stderr, "FILE CREATE ERROR![%s]\n", dest);
-		exit(1);
-	}
+    if ((fp = fopen(dest, "wb")) == NULL) {
+        fprintf(stderr, "FILE CREATE ERROR![%s]\n", dest);
+        exit(1);
+    }
 
-	encode();
+    encode(fp, insize, bz);
 
-	fprintf(fp, "Yay0");
+    return 0;
+}
 
-	writeint4(insize);
+void encode(FILE* fp, int insize, unsigned char* bz) {
+    int             pp; // weak
+    int             dp; // idb
+    unsigned int*   cmd;
+    unsigned char*  def;
+    unsigned short* pol;
+    unsigned int    v0;  // esi
+    unsigned int    v1 = 0;  // edi
+    int             v2 = 0;  // edx
+    int             v3 = 0;  // ebx
+    int             v4 = 0;  // edx
+    unsigned int    v6;  // [esp+10h] [ebp-14h]
+    unsigned int    v7 = 0;  // [esp+14h] [ebp-10h]
+    int             v8 = 0;  // [esp+18h] [ebp-Ch]
+    unsigned int    a4 = 0;  // [esp+1Ch] [ebp-8h]
+    int             a3 = 0;  // [esp+20h] [ebp-4h]
+    int             ncp; // weak
+    int             npp; // weak
+    int             ndp; // weak
+    int             cp;
 
-	writeint4(4 * cp + 16);
-	writeint4(2 * pp + 4 * cp + 16);
+    dp  = 0;
+    pp  = 0;
+    cp  = 0;
+    npp = 0x1000;
+    ndp = 0x1000;
+    ncp = 0x1000;
+    cmd = calloc(0x4000, 1);
+    pol = malloc(2 * npp);
+    def = malloc(4 * ndp);
+    v0  = 0;
+    v6  = 1024;
+    v1  = 0x80000000;
+    while (v0 < insize) {
+        if (dp == 73) {
+            int dog = 5;
+        }
 
-	for (int i = 0; i < cp; i++)
-		writeint4(cmd[i]);
+        if (v6 < v0) {
+            v6 += 1024;
+        }
+        search(v0, insize, &a3, &a4, bz);
+        if (a4 <= 2) {
+            cmd[cp]   |= v1;
+            def[dp++]  = bz[v0++];
+            if (ndp == dp) {
+                ndp = dp + 0x1000;
+                def = realloc(def, dp + 0x1000);
+            }
+        } else {
+            search(v0 + 1, insize, &v8, &v7, bz);
+            if (v7 > a4 + 1) {
+                cmd[cp]   |= v1;
+                def[dp++]  = bz[v0++];
+                if (ndp == dp) {
+                    ndp = dp + 0x1000;
+                    def = realloc(def, dp + 0x1000);
+                }
+                v1 >>= 1;
+                if (!v1) {
+                    v1 = 0x80000000;
+                    v2 = cp++;
+                    if (cp == ncp) {
+                        ncp = v2 + 1025;
+                        cmd = realloc(cmd, 4 * (v2 + 1025));
+                    }
+                    cmd[cp] = 0;
+                }
+                a4 = v7;
+                a3 = v8;
+            }
+            v3 = v0 - a3 - 1;
+            a3 = v0 - a3 - 1;
+            if (a4 > 0x11) {
+                pol[pp++] = v3;
+                def[dp++] = a4 - 18;
+                if (ndp == dp) {
+                    ndp = dp + 0x1000;
+                    def = realloc(def, dp + 0x1000);
+                }
+            } else {
+                pol[pp++] = v3 | (((short)a4 - 2) << 12);
+            }
+            if (npp == pp) {
+                npp += 0x1000;
+                pol = realloc(pol, 2 * (pp + 0x1000));
+            }
+            v0 += a4;
+        }
+        v1 >>= 1;
+        if (!v1) {
+            v1 = 0x80000000;
+            v4 = cp++;
+            if (cp == ncp) {
+                ncp = v4 + 1025;
+                cmd = realloc(cmd, 4 * (v4 + 1025));
+            }
+            cmd[cp] = 0;
+        }
+    }
+    if (v1 != 0x80000000) {
+        cp++;
+    }
 
-	for (int i = 0; i < pp; i++)
-		writeshort(pol[i]);
+    fprintf(fp, "Yay0");
 
-	fwrite(def, 1u, dp, fp);
-	fclose(fp);
+    writeint4(fp, insize);
 
-	return 0;
-}
+    writeint4(fp, 4 * cp + 16);
+    writeint4(fp, 2 * pp + 4 * cp + 16);
 
-void encode()
-{
-	unsigned int v0; // esi
-	unsigned int v1; // edi
-	int v2; // edx
-	int v3; // ebx
-	int v4; // edx
-	char v5; // [esp+Ch] [ebp-18h]
-	unsigned int v6; // [esp+10h] [ebp-14h]
-	unsigned int v7; // [esp+14h] [ebp-10h]
-	int v8; // [esp+18h] [ebp-Ch]
-	unsigned int a4; // [esp+1Ch] [ebp-8h]
-	int a3; // [esp+20h] [ebp-4h]
-
-	dp = 0;
-	pp = 0;
-	cp = 0;
-	npp = 4096;
-	ndp = 4096;
-	ncp = 4096;
-	cmd = calloc(0x4000u, 1u);
-	pol = malloc(2 * npp);
-	def = malloc(4 * ndp);
-	v0 = 0;
-	v6 = 1024;
-	v1 = 2147483648;
-	while ( insize > v0 )
-	{
-		if ( v6 < v0 )
-			v6 += 1024;
-		search(v0, insize, &a3, &a4);
-		if ( a4 <= 2 )
-		{
-			cmd[cp] |= v1;
-			def[dp++] = bz[v0++];
-			if ( ndp == dp )
-			{
-				ndp = dp + 4096;
-				def = realloc(def, dp + 4096);
-			}
-		}
-		else
-		{
-			search(v0 + 1, insize, &v8, &v7);
-			if ( v7 > a4 + 1 )
-			{
-				cmd[cp] |= v1;
-				def[dp++] = bz[v0++];
-				if ( ndp == dp )
-				{
-					ndp = dp + 4096;
-					def = realloc(def, dp + 4096);
-				}
-				v1 >>= 1;
-				if ( !v1 )
-				{
-					v1 = 2147483648;
-					v2 = cp++;
-					if ( cp == ncp )
-					{
-						ncp = v2 + 1025;
-						cmd = realloc(cmd, 4 * (v2 + 1025));
-					}
-					cmd[cp] = 0;
-				}
-				a4 = v7;
-				a3 = v8;
-			}
-			v3 = v0 - a3 - 1;
-			a3 = v0 - a3 - 1;
-			v5 = a4;
-			if ( a4 > 0x11 )
-			{
-				pol[pp++] = v3;
-				def[dp++] = v5 - 18;
-				if ( ndp == dp )
-				{
-					ndp = dp + 4096;
-					def = realloc(def, dp + 4096);
-				}
-			}
-			else
-			{
-				pol[pp++] = v3 | (((short)a4 - 2) << 12);
-			}
-			if ( npp == pp )
-			{
-				npp = pp + 4096;
-				pol = realloc(pol, 2 * (pp + 4096));
-			}
-			v0 += a4;
-		}
-		v1 >>= 1;
-		if ( !v1 )
-		{
-			v1 = 2147483648;
-			v4 = cp++;
-			if ( cp == ncp )
-			{
-				ncp = v4 + 1025;
-				cmd = realloc(cmd, 4 * (v4 + 1025));
-			}
-			cmd[cp] = 0;
-		}
-	}
-	if ( v1 != 0x80000000 )
-		++cp;
-	//fprintf(stderr, "IN=%d OUT=%d\n", insize, dp + 2 * pp + 4 * cp + 16);
-}
+    for (int i = 0; i < cp; i++)
+        writeint4(fp, cmd[i]);
+
+    for (int i = 0; i < pp; i++)
+        writeshort(fp, pol[i]);
 
-void search(unsigned int a1, int a2, int *a3, unsigned int *a4)
-{
-	unsigned int v4; // ebx
-	unsigned int v5; // esi
-	unsigned int *v6; // edi
-	unsigned int v7; // [esp+Ch] [ebp-10h]
-	int v8; // [esp+14h] [ebp-8h]
-	unsigned int v9; // [esp+18h] [ebp-4h]
-
-	v4 = 3;
-	v5 = 0;
-	if ( a1 > 0x1000 )
-		v5 = a1 - 4096;
-	v9 = 273;
-	if ( a2 - a1 <= 0x111 )
-		v9 = a2 - a1;
-	if ( v9 > 2 )
-	{
-		while ( a1 > v5 )
-		{
-			v7 = mischarsearch(&bz[a1], v4, &bz[v5], v4 + a1 - v5);
-			if ( v7 >= a1 - v5 )
-				break;
-			for ( ; v9 > v4; ++v4 )
-			{
-				if ( bz[v4 + v5 + v7] != bz[v4 + a1] )
-					break;
-			}
-			if ( v9 == v4 )
-			{
-				*a3 = v7 + v5;
-				goto LABEL_17;
-			}
-			v8 = v5 + v7;
-			++v4;
-			v5 += v7 + 1;
-		}
-		*a3 = v8;
-		if ( v4 > 3 )
-		{
-			--v4;
-LABEL_17:
-			*a4 = v4;
-			return;
-		}
-		v6 = a4;
-	}
-	else
-	{
-		*a4 = 0;
-		v6 = a3;
-	}
-	*v6 = 0;
+    fwrite(def, 1, dp, fp);
+    fclose(fp);
 }
 
-int mischarsearch(unsigned char *pattern, int patternlen, unsigned char *data, int datalen)
-{
-  int result; // eax
-  int i; // ebx
-  int v6; // eax
-  int j; // ecx
-
-  result = datalen;
-  if ( patternlen <= datalen )
-  {
-    initskip(pattern, patternlen);
-    for ( i = patternlen - 1; ; i += v6 )
-    {
-      if ( pattern[patternlen - 1] == data[i] )
-      {
-        --i;
-        j = patternlen - 2;
-        if ( patternlen - 2 < 0 )
-          return i + 1;
-        while ( pattern[j] == data[i] )
-        {
-          --i;
-          if ( --j < 0 )
-            return i + 1;
+void search(unsigned int a1, int insize, int* a3, unsigned int* a4, unsigned char* bz) {
+    unsigned int  patternlen; // ebx
+    unsigned int  v5; // esi
+    unsigned int* v6 = 0; // edi
+    unsigned int  v7 = 0; // [esp+Ch] [ebp-10h]
+    int           v8 = 0; // [esp+14h] [ebp-8h]
+    unsigned int  v9; // [esp+18h] [ebp-4h]
+
+    patternlen = 3;
+    v5 = 0;
+    if (a1 > 0x1000) {
+        v5 = a1 - 0x1000;
+    }
+    v9 = 273;
+    if (insize - a1 <= 273) {
+        v9 = insize - a1;
+    }
+    if (v9 > 2) {
+        while (a1 > v5) {
+            v7 = mischarsearch(&bz[a1], patternlen, &bz[v5], patternlen + a1 - v5);
+
+            if (v7 >= a1 - v5) {
+                break;
+            }
+
+            for (; patternlen < v9; patternlen++) {
+                if (bz[patternlen + v5 + v7] != bz[patternlen + a1]) {
+                    break;
+                }
+            }
+            if (v9 == patternlen) {
+                *a3 = v7 + v5;
+                *a4 = patternlen;
+                return;
+            }
+            v8 = v5 + v7;
+            patternlen++;
+            v5 += v7 + 1;
+        }
+        *a3 = v8;
+        if (patternlen > 3) {
+            patternlen--;
+            *a4 = patternlen;
+            return;
         }
-        v6 = patternlen - j;
-        if ( skip[data[i]] > patternlen - j )
-          v6 = skip[data[i]];
-      }
-      else
-      {
-        v6 = skip[data[i]];
-      }
+        v6 = a4;
+    } else {
+        *a4 = 0;
+        v6  = a3;
     }
-  }
-  return result;
+    *v6 = 0;
 }
 
-void initskip(unsigned char *pattern, int len)
-{
-	for (int i = 0; i < 256; i++)
-		skip[i] = len;
+int mischarsearch(unsigned char* pattern, int patternlen, unsigned char* data, int datalen) {
+    unsigned short skip[256]; // idb
+    int            i;         // ebx
+    int            v6;        // eax
+    int            j;         // ecx
 
-	for (int i = 0; i < len; i++)
-		skip[pattern[i]] = len - i - 1;
+    if (patternlen <= datalen) {
+        // initskip
+        for (int k = 0; k < 256; k++) {
+            skip[k] = patternlen;
+        }
+
+        for (int k = 0; k < patternlen; k++) {
+            skip[pattern[k]] = patternlen - k - 1;
+        }
+
+        for (i = patternlen - 1;; i += v6) {
+            if (pattern[patternlen - 1] == data[i]) {
+                i--;
+                j = patternlen - 2;
+                if (j < 0) {
+                    return i + 1;
+                }
+
+                while (pattern[j] == data[i]) {
+                    i--;
+                    j--;
+                    if (j < 0) {
+                        return i + 1;
+                    }
+                }
+
+                if (skip[data[i]] <= patternlen - j) {
+                    v6 = patternlen - j;
+                    continue;
+                }
+            }
+            v6 = skip[data[i]];
+        }
+    }
+    return datalen;
 }
 
-void writeshort(short val)
-{
-	fputc((val & 0xff00) >> 8, fp);
-	fputc((val & 0x00ff) >> 0, fp);
+void writeshort(FILE* fp, short val) {
+    fputc((val & 0xff00) >> 8, fp);
+    fputc((val & 0x00ff) >> 0, fp);
 }
 
-void writeint4(int val)
-{
-	fputc((val & 0x00ff000000) >> 24, fp);
-	fputc((val & 0x0000ff0000) >> 16, fp);
-	fputc((val & 0x000000ff00) >>  8, fp);
-	fputc((val & 0x00000000ff) >>  0, fp);
+void writeint4(FILE* fp, int val) {
+    fputc((val & 0x00ff000000) >> 24, fp);
+    fputc((val & 0x0000ff0000) >> 16, fp);
+    fputc((val & 0x000000ff00) >> 8, fp);
+    fputc((val & 0x00000000ff) >> 0, fp);
 }
diff --git a/ver/us/splat.yaml b/ver/us/splat.yaml
index 8fee4f6cfe5..faa79543937 100644
--- a/ver/us/splat.yaml
+++ b/ver/us/splat.yaml
@@ -14725,7 +14725,7 @@ segments:
 #################
 ### Dead maps ###
 #################
-  - [0xE9ECD0, bin] # tail of dead kzn_11
+  - [0xE9ECD0, bin, dead_kzn_11_end] # tail of dead kzn_11
   #- name: dead_kzn_11
   #  dir: world/dead/area_kzn/kzn_11
   #  type: code
@@ -15006,9 +15006,10 @@ segments:
     - [auto, c, flo_19_5_beanstalk]
 
   - [0xF00000, pm_sbn, audio]
-  - [0x1942C40, bin]
+  - [0x1942C40, bin, copy_1942C40] # copy of 0x1642C40 - 0x1643000
   - { start: 0x1943000, align: 8, type: pm_sprites, name: sprites }
-  - [0x1B82208, bin] # end of sprite data - todo: figure out what this is
+  - [0x1B82208, bin, pad_1B82208] # zeros
+  - [0x1B8220C, bin, copy_1B8220C] # copy of 0x188220C - 0x1883000
   - start: 0x1B83000
     type: pm_msg
     files:
@@ -15059,8 +15060,8 @@ segments:
       - 2C_QuizQuestions
       - 2D_QuizChoices
       - 2E_Credits
-  - [0x1C84D30, bin] # junk(?)
-  - [0x1E00000, bin] # junk (player sprite data; can be zeroed out with no effect)
+  - [0x1C84D30, bin, unk_1C84D30] # junk(?)
+  - [0x1E00000, bin, copy_1E00000] # copy of 0x1943000 - 0x1983000
   - [0x1E40000, pm_map_data, mapfs]
-  - { type: bin, start: 0x27FEE22, subalign: 2 }
+  - { name: copy_27FEE22, type: bin, start: 0x27FEE22, subalign: 2 } # copy of 0x232EE22 - 0x2330000
   - [0x2800000]