diff --git a/.gitignore b/.gitignore
index 9491a2f..11ae725 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,6 +3,9 @@
 ##
 ## Get latest from https://github.com/github/gitignore/blob/master/VisualStudio.gitignore
 
+# Project-specific files
+results.bin
+
 # User-specific files
 *.rsuser
 *.suo
diff --git a/julia/PolycubeCounting.jl b/julia/PolycubeCounting.jl
index 0d9ab0f..a42bdb1 100644
--- a/julia/PolycubeCounting.jl
+++ b/julia/PolycubeCounting.jl
@@ -4,6 +4,7 @@ include("plot.jl")
 using XXhash
 using Serialization
 using Combinatorics
+using WAV
 
 function options()
     println("scanForPolycubes(MaxSize::Int64): scans for Polycubes of size <=MaxSize")
@@ -12,13 +13,20 @@ function options()
     println("plotPolycubes(nCubes::Int64, index::Int64=-1): plots Polycubes of size v[1], or just v[2] from the list")
 end
 
-function scanForPolycubes(MaxSize::Int64)
-    D = Dict{UInt, ImmutableOrientedPolycube}()
-    singletonCube = getCube()
-    immutableCube = getImmutableOrientedPolycube(singletonCube)
-    D[immutableCube.hash] = immutableCube
-    evaluatePolycube(singletonCube, D, MaxSize)
-    serialize("julia/results.bin", sanitize(D, MaxSize))
+function scanForPolycubes(MaxSize::Int64, debug::Bool=false)
+    T = deserialize("julia/results.bin")
+    n = T[1]
+    if (~debug && MaxSize <= n) return; end
+    @time begin
+        D = Dict{UInt, ImmutableOrientedPolycube}()
+        singletonCube = getCube()
+        immutableCube = getImmutableOrientedPolycube(singletonCube)
+        D[immutableCube.hash] = immutableCube
+        evaluatePolycube(singletonCube, D, MaxSize)
+    end
+    if (~debug) serialize("julia/results.bin", sanitize(D, MaxSize)) end
+    y, fs = wavread("julia/background-error.wav")
+    wavplay(y, fs)
 end
 
 function evaluatePolycube(polycube::Polycube, D::Dict{UInt, ImmutableOrientedPolycube}, MaxSize::Int64)
diff --git a/julia/background-error.wav b/julia/background-error.wav
new file mode 100644
index 0000000..26672f1
Binary files /dev/null and b/julia/background-error.wav differ