increase parallel jobs for spliting track

app.py

@@ -22,7 +22,7 @@ MODEL = None
 def split_process(audio, chosen_out_track):
     os.makedirs("out", exist_ok=True)
     write('test.wav', audio[0], audio[1])
-    os.system("python3 -m demucs.separate -n mdx_extra_q -d cpu test.wav -o out")
+    os.system("python3 -m demucs.separate -n mdx_extra_q -j 4 test.wav -o out")
     #return "./out/mdx_extra_q/test/vocals.wav","./out/mdx_extra_q/test/bass.wav","./out/mdx_extra_q/test/drums.wav","./out/mdx_extra_q/test/other.wav"
     if chosen_out_track == "vocals":
         return "./out/mdx_extra_q/test/vocals.wav"