diff --git a/.gitignore b/.gitignore
index ea4cdc7..da31a1e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,4 @@
 .rspec_status
 .byebug_history
 TAGS
+/.gtm/
diff --git a/lib/scruby/ugen/base.rb b/lib/scruby/ugen/base.rb
index 9807cfe..3a8b12e 100644
--- a/lib/scruby/ugen/base.rb
+++ b/lib/scruby/ugen/base.rb
@@ -37,6 +37,21 @@ def input_values
         inputs.values.flatten
       end
 
+      # TODO: no specs
+      def rate_index
+        E_RATES.index(rate)
+      end
+
+      # TODO: no specs
+      def output_specs #:nodoc:
+        [ E_RATES.index(rate) ]
+      end
+
+      # TODO: no specs
+      def channels_count
+        1
+      end
+
       protected
 
       def rate=(rate)
diff --git a/lib/scruby/ugen/graph.rb b/lib/scruby/ugen/graph.rb
index d0a71a0..2e91ad8 100644
--- a/lib/scruby/ugen/graph.rb
+++ b/lib/scruby/ugen/graph.rb
@@ -23,18 +23,23 @@ def encode
         [ encode_constants,
           encode_controls,
           encode_control_names,
-          encode_nodes
+          encode_nodes,
+          encode_variants
         ].join
       end
 
       private
 
       def encode_controls
-        [ 0 ].pack("N")
+        encode_int32(0)
       end
 
       def encode_control_names
-        [ 0 ].pack("N")
+        encode_int32(0)
+      end
+
+      def encode_variants
+        encode_int16(0)
       end
 
       def encode_constants
@@ -42,7 +47,7 @@ def encode_constants
       end
 
       def encode_nodes
-        [ nodes.size ].pack("N") + nodes.map(&:encode).join
+        encode_int32(nodes.size) + nodes.map(&:encode).join
       end
     end
   end
diff --git a/lib/scruby/ugen/graph/node.rb b/lib/scruby/ugen/graph/node.rb
index e8cc3af..1c84400 100644
--- a/lib/scruby/ugen/graph/node.rb
+++ b/lib/scruby/ugen/graph/node.rb
@@ -24,12 +24,12 @@ def initialize(value, graph)
         def encode
           [
             encode_string(value.name),
-            encode_int8(rate_index),
+            encode_int8(value.rate_index),
             encode_int32(inputs.count),
-            encode_int32(channels_count),
+            encode_int32(value.channels_count),
             encode_int16(special_index),
             collect_input_specs.flatten.pack("N*"),
-            output_specs.map { |i| encode_int8(i) }.join
+            value.output_specs.map { |i| encode_int8(i) }.join
           ].join
         end
 
@@ -56,18 +56,6 @@ def special_index
           0
         end
 
-        def channels_count
-          1
-        end
-
-        def rate_index
-          E_RATES.index(rate)
-        end
-
-        def output_specs #:nodoc:
-          [ E_RATES.index(rate) ]
-        end
-
         def collect_input_specs #:nodoc:
           inputs.map(&:input_specs)
         end
diff --git a/lib/scruby/ugen/out.rb b/lib/scruby/ugen/out.rb
index 866f0bb..3ff6541 100644
--- a/lib/scruby/ugen/out.rb
+++ b/lib/scruby/ugen/out.rb
@@ -4,8 +4,15 @@ class Out < Ugen::Base
       rates :control, :audio
       inputs bus: nil, channels_array: nil
 
-      # @channels = []
-      # def output_specs; []; end
+      # TODO: no specs
+      def output_specs
+        []
+      end
+
+      # TODO: no specs
+      def channels_count
+        0
+      end
 
       class << self
         def ar(bus, *inputs)
diff --git a/spec/ugen/graph_spec.rb b/spec/ugen/graph_spec.rb
index da2c736..02e4918 100644
--- a/spec/ugen/graph_spec.rb
+++ b/spec/ugen/graph_spec.rb
@@ -7,29 +7,21 @@
       let(:ugen) { Ugen::Out.ar(1, sin_osc) }
 
       let(:expected) do
-        %w(
-          00 00 00 03  43
-          dc 00 00 00  00 00 00 3f  80 00 00 00  00 00 00 00
-          00 00 00 00  00 00 02 06  53 69 6e 4f  73 63 02 00
-          00 00 02 00  00 00 01 00  00 ff ff ff  ff 00 00 00
-          00 ff ff ff  ff 00 00 00  01 02 03 4f  75 74 02 00
-          00 00 02 00  00 00 00 00  00 ff ff ff  ff 00 00 00
-          02 00 00 00  00 00 00 00  00 00 00 00  00 00 00 00
-        )
+        [ 0, 0, 0, 3, 67, -36, 0, 0, 0, 0, 0, 0, 63, -128, 0, 0, 0, 0,
+          0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 6, 83, 105, 110, 79, 115, 99,
+          2, 0, 0, 0, 2, 0, 0, 0, 1, 0, 0, -1, -1, -1, -1, 0, 0, 0, 0,
+          -1, -1, -1, -1, 0, 0, 0, 1, 2, 3, 79, 117, 116, 2, 0, 0, 0,
+          2, 0, 0, 0, 0, 0, 0, -1, -1, -1, -1, 0, 0, 0, 2, 0, 0, 0, 0,
+          0, 0, 0, 0, 0, 0 ].pack("C*")
       end
 
       subject(:graph) { described_class.new(ugen) }
 
-      let(:encoded) do
-        graph.encode.unpack("C*")
-          .map { |num| num.to_s(16).rjust(2, "0") }
-      end
-
       it { expect(graph.constants.map(&:value)).to eq [ 440, 0, 1 ] }
       it { expect(graph.nodes.map(&:value)).to eq [ sin_osc, ugen ] }
 
       it "should encode graph" do
-        expect(encoded).to eq(expected)
+        expect(graph.encode).to eq(expected)
       end
     end
   end