diff --git a/penn/config/defaults.py b/penn/config/defaults.py
index 87c720c..78e4a71 100644
--- a/penn/config/defaults.py
+++ b/penn/config/defaults.py
@@ -62,7 +62,7 @@
 LOCAL_PITCH_WINDOW_SIZE = 19
 
 # Pitch velocity constraint for viterbi decoding
-MAX_OCTAVES_PER_SECOND = 6.
+MAX_OCTAVES_PER_SECOND = 32.
 
 # Maximum chunk size for chunked Viterbi decoding
 VITERBI_MIN_CHUNK_SIZE = None
diff --git a/penn/decode.py b/penn/decode.py
index 2cd4fb1..936fbee 100644
--- a/penn/decode.py
+++ b/penn/decode.py
@@ -1,7 +1,6 @@
 import abc
 import functools
 
-import numpy as np
 import torbi
 import torch