diff --git a/bin/curvecalc b/bin/curvecalc
--- a/bin/curvecalc
+++ b/bin/curvecalc
@@ -18,9 +18,7 @@ from light9 import Submaster, dmxclient,
 from light9.TLUtility import make_attributes_from_args
 from light9.zoomcontrol import Zoomcontrol
 from light9.curve import Curve, Curveview, Curveset, Curvesetview
-
-sys.path.extend(["../semprini","../../semprini"])
-from lengther import wavelength # for measuring duration of .wav
+from light9.wavelength import wavelength 
 
 class Music:
     def __init__(self):