add silence to ambiance mix

README.md

@@ -24,7 +24,7 @@ Saul opening will be chosen as a callback to the original AI Sponge.
 The available sound effects are steel sting, boowomp, vibe link (b), disgusting fog horn, "My leg!", "Oh brother this 
 guy stinks!", "You what?", and the dolphin censor sound. One of these is chosen at random to play at a random point per 
 episode. Every episode begins with the bubbles transition sound. Every episode also has background ambiance that can be 
-either underwater sounds or night crickets, with a chance of rain sounds on top of that.
+underwater sounds night crickets, or silence, with a chance of rain sounds on top of that.
 
 ### Random Events
 

main.py

@@ -169,11 +169,14 @@ async def generate(inter: discord.Interaction, topic: str) -> None:
                 music_loop = silence_music.append(music.fade_in(10000), 0)
                 while len(music_loop) < len(combined):
                     music_loop = music_loop.append(music, 0)
-                ambiance = random.choice([sfx_day, sfx_night])
-                ambiance_loop = ambiance
-                while len(ambiance_loop) < len(combined):
-                    ambiance_loop = ambiance_loop.append(ambiance, 0)
-                if random.randrange(4) > 0:
+                if random.randrange(3) > 0:
+                    ambiance = random.choice([ambiance_day, ambiance_night])
+                    ambiance_loop = ambiance
+                    while len(ambiance_loop) < len(combined):
+                        ambiance_loop = ambiance_loop.append(ambiance, 0)
+                else:
+                    ambiance_loop = AudioSegment.empty()
+                if random.randrange(5) > 0:
                     rain_loop = AudioSegment.empty()
                 else:
                     rain_loop = ambiance_rain