diff --git a/example/src/main.rs b/example/src/main.rs
index 377dbdf..d70505e 100644
--- a/example/src/main.rs
+++ b/example/src/main.rs
@@ -1,14 +1,13 @@
-use std::collections::VecDeque;
 use std::fmt::Display;
 use std::fs::File;
 use std::io::Write;
-use std::sync::mpmc::sync_channel;
 use std::sync::mpsc;
 
 use eframe::NativeOptions;
 use egui_plot::Line;
 use egui_plot::PlotPoints;
 use num::Complex;
+use oxydsp_dsp::blocks::math::basic::Adder;
 use oxydsp_dsp::blocks::math::basic::Multiplier;
 use oxydsp_dsp::blocks::synthesis::Nco;
 use oxydsp_dsp::blocks::synthesis::OscillatorSource;
@@ -33,48 +32,26 @@ use crate::printer_synchronous_block::PrinterView;
 
 #[derive(BlockIO)]
 #[sync_block]
-pub struct Printer<T: 'static>
+pub struct Printer<T: 'static + Display>
 {
     #[input]
     input: In<T>,
 
-    #[input]
-    input_b: In<u32>,
-
-    #[output]
-    output_a: Out<u32>,
-
     n: usize,
 }
 
-impl<'view, T> SyncBlock<'view> for Printer<T>
+impl<'view, T: 'static + Display> SyncBlock<'view> for Printer<T>
 {
     fn sync_work(state: Self::StateView, input: Self::Input) -> Option<Self::Output>
     {
-        None
-    }
-}
+        *state.n += 1;
 
-impl<T: 'static> Block for Printer<T>
-{
-    fn work(&mut self) -> BlockResult
-    {
-        let state = PrinterView {
-            n: &mut self.n,
-            _sync_block_phantom: Default::default(),
-        };
+        if state.n.is_multiple_of(1_000_000)
+        {
+            println!("{}", input);
+        }
 
-        let output_a_write = self.output_a.write();
-        (&mut self.input, &mut self.input_b).pop_iter().for_each(
-            |((input_el, input_tag), (input_b_el, input_b_tag))| {
-                let new_tag = Tag::from([input_tag, input_b_tag]);
-                let output_a_el = <Self as SyncBlock>::sync_work(state, (input_el, input_b_el));
-
-                output_a_write.push((output_a_el, new_tag));
-            },
-        );
-
-        todo!()
+        Some(())
     }
 }
 
@@ -93,7 +70,7 @@ impl<T: 'static> Block for Printer<T>
 //     }
 // }
 
-impl<T: 'static> Printer<T>
+impl<T: 'static + Display> Printer<T>
 {
     pub fn new(input: In<T>) -> Self
     {
@@ -101,26 +78,18 @@ impl<T: 'static> Printer<T>
     }
 }
 
-impl<T: 'static> Block for Printer<T>
-where
-    T: Display,
+fn main()
 {
-    fn work(&mut self) -> oxydsp_flowgraph::block::BlockResult
-    {
-        for x in self.input.pop_iter()
-        {
-            if self.n.is_multiple_of(2usize.pow(20))
-            {
-                println!("{}", x);
-                self.n = 0;
-            }
-            self.n += 1;
-        }
-        BlockResult::Ok
-    }
+    let (iter_source_a, a) = IterSource::new(0..);
+    let (iter_source_b, b) = IterSource::new(0..);
+    let (adder, a) = Adder::new(a, b);
+    let printer = Printer::new(a);
+
+    let fg = flowgraph![iter_source_a, iter_source_b, adder, printer];
+    let _ = fg.run().join();
 }
 
-fn main()
+fn main_fsk()
 {
     let sample_rate = 48_000;
     let sample_per_symbol = 96;