diff --git a/src/libultra/voice/voicecheckresult.c b/src/libultra/voice/voicecheckresult.c
index 907376734..0d306884d 100644
--- a/src/libultra/voice/voicecheckresult.c
+++ b/src/libultra/voice/voicecheckresult.c
@@ -2,18 +2,18 @@
 
 s32 __osVoiceCheckResult(OSVoiceHandle* hd, u8* status) {
     s32 errorCode;
-    u8 sp20[2];
+    u8 data[2];
 
     if (errorCode = __osVoiceGetStatus(hd->mq, hd->port, status), errorCode == 0) {
         if (*status & 1) {
             errorCode = CONT_ERR_VOICE_NO_RESPONSE;
-        } else if (errorCode = __osVoiceContRead2(hd->mq, hd->port, 0, sp20), errorCode == 0) {
-            hd->status = sp20[0] & 7;
+        } else if (errorCode = __osVoiceContRead2(hd->mq, hd->port, 0, data), errorCode == 0) {
+            hd->status = data[0] & 7;
 
-            if (sp20[0] & 0x40) {
+            if (data[0] & 0x40) {
                 errorCode = CONT_ERR_VOICE_NO_RESPONSE;
             } else {
-                errorCode = sp20[1] << 8;
+                errorCode = data[1] << 8;
             }
         }
     }
diff --git a/src/libultra/voice/voicecleardictionary.c b/src/libultra/voice/voicecleardictionary.c
index 9bb490a97..719c7f0dc 100644
--- a/src/libultra/voice/voicecleardictionary.c
+++ b/src/libultra/voice/voicecleardictionary.c
@@ -1,10 +1,18 @@
 #include "global.h"
 
-// Initializes Voice Recognition System word registration dictionary
-s32 osVoiceClearDictionary(OSVoiceHandle* hd, u8 words) {
-    u8* registration_word;
+/**
+ * Initializes Voice Recognition System word registration dictionary.
+ * 
+ * The dictionary is initialized so that the specified "numWords" can be
+ * registered in the dictionary. 1-255 words can be registered in the dictionary.
+ * 
+ * Words cannot be registered with the osVoiceSetWord before the dictionary 
+ * is initialized with the osVoiceClearDictionary function
+ */
+s32 osVoiceClearDictionary(OSVoiceHandle* hd, u8 numWords) {
+    u8* data; // u8 data[4];
     u8 status;
-    s32 sp24;
+    u32 data32; // data[4] as u32
     s32 errorCode;
 
     errorCode = __osVoiceGetStatus(hd->mq, hd->port, &status);
@@ -12,15 +20,22 @@ s32 osVoiceClearDictionary(OSVoiceHandle* hd, u8 words) {
         return errorCode;
     }
 
-    registration_word = &sp24;
+    data = (u8*)&data32;
+
     if (status & 2) {
         return CONT_ERR_VOICE_NO_RESPONSE;
     }
 
-    sp24 = 0x2000000;
-    registration_word[2] = words;
+    /**
+     * data[0] = 2
+     * data[1] = 0
+     * data[2] = numWords
+     * data[3] = 0
+     */
+    data32 = 0x2000000;
+    data[2] = numWords;
 
-    errorCode = __osVoiceContWrite4(hd->mq, hd->port, 0, registration_word);
+    errorCode = __osVoiceContWrite4(hd->mq, hd->port, 0, data);
     if (errorCode != 0) {
         return errorCode;
     }
diff --git a/src/libultra/voice/voiceinit.c b/src/libultra/voice/voiceinit.c
index 7cc4f817a..8a1aeac11 100644
--- a/src/libultra/voice/voiceinit.c
+++ b/src/libultra/voice/voiceinit.c
@@ -8,7 +8,10 @@ s32 osVoiceInit(OSMesgQueue* siMessageQ, OSVoiceHandle* hd, s32 channel) {
     s32 errorCode;
     u8* phi_s0;
     u8 status = 0;
-    s32 sp30;
+    union {
+        s32 data32;
+        u8 data[4];
+    } u;
     s32 pad;
 
     hd->port = channel;
@@ -41,8 +44,14 @@ s32 osVoiceInit(OSMesgQueue* siMessageQ, OSVoiceHandle* hd, s32 channel) {
                 return CONT_ERR_VOICE_NO_RESPONSE;
             }
 
-            sp30 = 0x100;
-            errorCode = __osVoiceContWrite4(siMessageQ, channel, 0, &sp30);
+            /**
+             * data[0] = 0
+             * data[1] = 0
+             * data[2] = 1
+             * data[3] = 0
+             */
+            u.data32 = 0x100;
+            errorCode = __osVoiceContWrite4(siMessageQ, channel, 0, u.data);
             if (errorCode != 0) {
                 return errorCode;
             }
diff --git a/src/libultra/voice/voicesetword.c b/src/libultra/voice/voicesetword.c
index 3c927740c..a5ef50348 100644
--- a/src/libultra/voice/voicesetword.c
+++ b/src/libultra/voice/voicesetword.c
@@ -6,7 +6,7 @@ s32 osVoiceSetWord(OSVoiceHandle* hd, u8* word) {
     s32 sp50;
     s32 errorCode;
     u8 status;
-    u8 sp20[0x28];
+    u8 data[40];
 
     errorCode = __osVoiceGetStatus(hd->mq, hd->port, &status);
     if (errorCode != 0) {
@@ -23,23 +23,23 @@ s32 osVoiceSetWord(OSVoiceHandle* hd, u8* word) {
         sp50 += 2;
     }
 
-    bzero(&sp20, 0x28);
+    bzero(&data, 40);
 
     for (i = 0; i < sp50; i += 2) {
-        sp20[0x27 - sp50 + i] = word[i];
-        sp20[0x27 - sp50 + i - 1] = word[i + 1];
+        data[39 - sp50 + i] = word[i];
+        data[39 - sp50 + i - 1] = word[i + 1];
     }
 
-    sp20[0x27 - i - 5] = 3;
+    data[39 - i - 5] = 3;
 
     if (sp50 >= 0xF) {
-        errorCode = __osVoiceContWrite20(hd->mq, hd->port, 0, &sp20);
+        errorCode = __osVoiceContWrite20(hd->mq, hd->port, 0, &data[0]);
         if (errorCode != 0) {
             return errorCode;
         }
     } 
 
-    errorCode = __osVoiceContWrite20(hd->mq, hd->port, 0, &sp20[0x14]);
+    errorCode = __osVoiceContWrite20(hd->mq, hd->port, 0, &data[20]);
     if (errorCode != 0) {
         return errorCode;
     }
diff --git a/src/libultra/voice/voicestartreaddata.c b/src/libultra/voice/voicestartreaddata.c
index 5e65d3ce4..07032ba67 100644
--- a/src/libultra/voice/voicestartreaddata.c
+++ b/src/libultra/voice/voicestartreaddata.c
@@ -4,7 +4,10 @@
 s32 osVoiceStartReadData(OSVoiceHandle* hd) {
     s32 errorCode;
     u8 status;
-    s32 sp24;
+    union {
+        s32 data32;
+        u8 data[4];
+    } u;
 
     errorCode = __osVoiceGetStatus(hd->mq, hd->port, &status);
     if (errorCode != 0) {
@@ -19,8 +22,14 @@ s32 osVoiceStartReadData(OSVoiceHandle* hd) {
         return CONT_ERR_INVALID;
     }
 
-    sp24 = 0x5000000;
-    errorCode = __osVoiceContWrite4(hd->mq, hd->port, 0, &sp24);
+    /**
+     * data[0] = 5
+     * data[1] = 0
+     * data[2] = 0
+     * data[3] = 0
+     */
+    u.data32 = 0x5000000;
+    errorCode = __osVoiceContWrite4(hd->mq, hd->port, 0, u.data);
 
     if (errorCode == 0) {
         errorCode = __osVoiceCheckResult(hd, &status);