Updated default parameters

README.md

@@ -134,7 +134,7 @@ Returns:
 ### map_to_wav
 
 ```python
-def map_to_wav(song_map: pd.DataFrame, out_file: str, velocity: int=100) -> pretty_midi.PrettyMIDI:
+def map_to_wav(song_map: pd.DataFrame, out_file: str, velocity: int=50) -> pretty_midi.PrettyMIDI:
 ```
 Convert "song map" to midi file (reverse process with respect to 
 midi_to_notes) and (optionally) save it, generating a PrettyMidi object in the process.
@@ -153,8 +153,8 @@ Returns:
 def generate_and_display(model: VAE, 
                          out_file: str=None, 
                          z_sample: tf.Tensor=None, 
-                         velocity: int=100, 
-                         seconds: int=120) -> display.Audio:
+                         velocity: int=50, 
+                         seconds: int=-1) -> display.Audio:
 ```
 Generate a song, (optionally) save it and display it.