added shot/bgm convert script

various-tools/4max & pc BGM + SHOT to 2OS BGM & SHOT/8.py

@@ -0,0 +1,32 @@
+import numpy as np
+import scipy.io.wavfile as wav
+import os
+
+file1 = input("Enter the first WAV file (music track): ").strip()
+file2 = input("Enter the second WAV file (SFX track): ").strip()
+
+rate1, data1 = wav.read(file1)
+rate2, data2 = wav.read(file2)
+
+if rate1 != rate2:
+    raise ValueError("Sample rate mismatch!")
+
+if data1.ndim != data2.ndim:
+    raise ValueError("Channel count mismatch!")
+
+# Convert to int32, addition (not normalization), then cap values.
+data1 = data1.astype(np.int32)
+data2 = data2.astype(np.int32)
+
+mixed = data1 + data2
+
+mixed = np.clip(mixed, -32768, 32767)
+
+mixed = mixed.astype(np.int16)
+
+dir_name, base_name = os.path.split(file2)
+output_file = os.path.join(dir_name, "1_" + base_name)
+
+wav.write(output_file, rate1, mixed)
+
+print(f"Mixing complete! Saved as {output_file}")

various-tools/4max & pc BGM + SHOT to 2OS BGM & SHOT/readme.txt

@@ -0,0 +1,4 @@
+The 2 platform uses BGM + SHOT, but mobile uses BGM or SHOT.
+This requires reprocessing the SHOT audio.
+Layering the audios directly (in audition, for example) won't work because the volume won't be preserved due to potential overflow of int16.
+This script preserves the volume by calculating things in int32 before capping everything back, ensuring that the audio volume stays consistent.