diff --git a/agb/src/sound/mixer/mixer.s b/agb/src/sound/mixer/mixer.s
index af28f05a..b37052e3 100644
--- a/agb/src/sound/mixer/mixer.s
+++ b/agb/src/sound/mixer/mixer.s
@@ -19,6 +19,7 @@ agb_arm_func agb_rs__mixer_add
     mov r8, #SOUND_BUFFER_SIZE @ the number of steps left
 
 1:
+.macro mixer_add_loop
     add r4, r0, r5, asr #8    @ calculate the address of the next read from the sound buffer
     ldrsb r6, [r4]           @ load the current sound sample to r6
     add r5, r5, r2           @ calculate the position to read the next sample from
@@ -28,8 +29,14 @@ agb_arm_func agb_rs__mixer_add
     mla r4, r6, r9, r4       @ r4 += r6 * r9 (calculating both the left and right samples together)
 
     str r4, [r1], #4         @ store the new value, and increment the pointer
+.endm
+    
+    mixer_add_loop
+    mixer_add_loop
+    mixer_add_loop
+    mixer_add_loop
 
-    subs r8, r8, #1          @ loop counter
+    subs r8, r8, #4          @ loop counter
     bne 1b                   @ jump back if we're done with the loop
 
     pop {r4-r10}