diff --git a/interface/src/main.rs b/interface/src/main.rs
index 3db6939..312152d 100644
--- a/interface/src/main.rs
+++ b/interface/src/main.rs
@@ -3,9 +3,10 @@ use std::{sync::mpsc, thread::sleep, time::Duration};
 
 use anyhow::{Context, Ok, Result};
 use cpal::traits::{DeviceTrait, HostTrait, StreamTrait};
-use pitch_detection::detector::{mcleod::McLeodDetector, PitchDetector};
+use pitch_detection::{detector::{mcleod::McLeodDetector, PitchDetector}, utils};
 
 fn main() -> Result<()> {
+    // assumes pulseaudio system with f32 samples and 2204 sample packets
     dbg!(cpal::available_hosts());
     let host = cpal::default_host();
     let device = host.devices().unwrap().find(|d|d.name().unwrap() == "pulse").context("no pulse")?;
@@ -19,11 +20,17 @@ fn main() -> Result<()> {
 
     const POWER_THRESHOLD: f32 = 5.0;
     const CLARITY_THRESHOLD: f32 = 0.7;
+    const PACKET_LEN: usize = 2204;
 
     let stream = device.build_input_stream(&config.into(), 
         move | data: &[f32], _: &_| {
-            let mut detctor = McLeodDetector::new(2204, 2204/2);
-            sender.send(detctor.get_pitch(&data[..2204], rate.0 as usize, POWER_THRESHOLD, CLARITY_THRESHOLD)).unwrap();
+            assert!(data.len() >= PACKET_LEN);
+            let data = &data[..PACKET_LEN];
+
+            // reinitialized every packet as it is not thread safe
+            let mut detctor = McLeodDetector::new(PACKET_LEN, PACKET_LEN/2);
+            let vol = utils::buffer::square_sum(data);
+            sender.send((detctor.get_pitch(data, rate.0 as usize, POWER_THRESHOLD, CLARITY_THRESHOLD),vol)).unwrap();
             
         }, 
         move |err| {eprintln!("{err}")} , 
@@ -31,14 +38,14 @@ fn main() -> Result<()> {
 
     stream.play()?;
 
-    for note in notes {
+    for (note,vol) in notes {
         if let Some(note) = note {
             dbg!(note.frequency);
             dbg!(note.clarity);
+            dbg!(vol);
         }
     }
 
-
     drop(stream);
 
     Ok(())