through AddTextPrinterWithCustomSpeedForMessage

asm/field_message_box.s

@@ -226,7 +226,7 @@ textbox_fdecode_auto_and_task_add: @ 80694C8
 	ldr r0, _080694E0 @ =gStringVar4
 	bl StringExpandPlaceholders
 	movs r0, 0x1
-	bl sub_80F6D5C
+	bl AddTextPrinterDiffStyle
 	bl task_add_textbox
 	pop {r0}
 	bx r0
@@ -238,7 +238,7 @@ _080694E0: .4byte gStringVar4
 textbox_auto_and_task_add: @ 80694E4
 	push {lr}
 	movs r0, 0x1
-	bl sub_80F6D5C
+	bl AddTextPrinterDiffStyle
 	bl task_add_textbox
 	pop {r0}
 	bx r0