diff --git a/TTS/aws_polly.py b/TTS/aws_polly.py
index 703aa6a..6cbe4c5 100644
--- a/TTS/aws_polly.py
+++ b/TTS/aws_polly.py
@@ -35,9 +35,9 @@ class AWSPolly:
         if random_voice:
             voice = self.randomvoice()
         else:
-            if not os.getenv("VOICE"):
+            if not os.getenv("AWS_VOICE"):
                 return ValueError(
-                    f"Please set the environment variable VOICE to a valid voice. options are: {voices}"
+                    f"Please set the environment variable AWS_VOICE to a valid voice. options are: {voices}"
                 )
             voice = str(os.getenv("AWS_VOICE")).capitalize()
         try:
diff --git a/TTS/engine_wrapper.py b/TTS/engine_wrapper.py
index 77f6eab..13ff850 100644
--- a/TTS/engine_wrapper.py
+++ b/TTS/engine_wrapper.py
@@ -72,7 +72,7 @@ class TTSEngine:
         print_substep("Saved Text to MP3 files successfully.", style="bold green")
         return self.length, idx
 
-    def split_post(self, text: str, idx: int) -> str:
+    def split_post(self, text: str, idx: int):
         split_files = []
         split_text = [
             x.group().strip()
@@ -88,9 +88,15 @@ class TTSEngine:
             f"{self.path}/{idx}.mp3", fps=44100, verbose=False, logger=None
         )
 
-        for i in range(0, idy + 1):
+        for i in split_files:
+            name = i.filename
+            i.close()
+            Path(name).unlink()
+
+        # for i in range(0, idy + 1):
             # print(f"Cleaning up {self.path}/{idx}-{i}.part.mp3")
-            Path(f"{self.path}/{idx}-{i}.part.mp3").unlink()
+
+            # Path(f"{self.path}/{idx}-{i}.part.mp3").unlink()
 
     def call_tts(self, filename: str, text: str):
         self.tts_module.run(text=process_text(text), filepath=f"{self.path}/{filename}.mp3")
@@ -100,6 +106,7 @@ class TTSEngine:
         #     self.length += sox.file_info.duration(f"{self.path}/{filename}.mp3")
         clip = AudioFileClip(f"{self.path}/{filename}.mp3")
         self.length += clip.duration
+        clip.close()
 
 def process_text(text: str):
     lang = getenv("POSTLANG", "")
diff --git a/TTS/streamlabs_polly.py b/TTS/streamlabs_polly.py
index 41fe269..066fa53 100644
--- a/TTS/streamlabs_polly.py
+++ b/TTS/streamlabs_polly.py
@@ -35,9 +35,9 @@ class StreamlabsPolly:
         if random_voice:
             voice = self.randomvoice()
         else:
-            if not os.getenv("VOICE"):
+            if not os.getenv("STREAMLABS_VOICE"):
                 return ValueError(
-                    f"Please set the environment variable VOICE to a valid voice. options are: {voices}"
+                    f"Please set the environment variable STREAMLABS_VOICE to a valid voice. options are: {voices}"
                 )
             voice = str(os.getenv("STREAMLABS_VOICE")).capitalize()
         body = {"voice": voice, "text": text, "service": "polly"}
diff --git a/video_creation/background.py b/video_creation/background.py
index 7bf6ae2..2654499 100644
--- a/video_creation/background.py
+++ b/video_creation/background.py
@@ -2,6 +2,7 @@ import random
 from os import listdir, environ
 from pathlib import Path
 from random import randrange
+from typing import Tuple
 
 from moviepy.editor import VideoFileClip
 from moviepy.video.io.ffmpeg_tools import ffmpeg_extract_subclip
@@ -10,7 +11,7 @@ from pytube import YouTube
 from utils.console import print_step, print_substep
 
 
-def get_start_and_end_times(video_length: int, length_of_clip: int) -> tuple[int, int]:
+def get_start_and_end_times(video_length: int, length_of_clip: int) -> Tuple[int, int]:
     """Generates a random interval of time to be used as the background of the video.
 
     Args: