diff --git a/src/track_triggering_job.rs b/src/track_triggering_job.rs
new file mode 100644
index 0000000..430a4bb
--- /dev/null
+++ b/src/track_triggering_job.rs
@@ -0,0 +1,289 @@
+use std::fmt::Debug;
+use std::rc::Rc;
+use std::sync::Arc;
+
+use crate::base::{OzzError, OzzObj};
+
+use crate::track::Track;
+
+/// Structure of an edge as detected by the job.
+#[derive(Debug, Default, Copy, Clone, PartialEq)]
+pub struct Edge {
+    /// Ratio at which track value crossed threshold.
+    ratio: f32,
+    /// true is edge is rising (getting higher than threshold).
+    rising: bool,
+}
+
+impl Edge {
+    /// Creates a new `Edge`.
+    pub fn new(ratio: f32, rising: bool) -> Edge {
+        return Edge {
+            ratio: ratio,
+            rising: rising,
+        };
+    }
+}
+
+#[derive(Debug)]
+pub struct TrackTriggeringJob<T = Rc<Track<f32>>>
+where
+    T: OzzObj<Track<f32>>,
+{
+    track: Option<T>,
+    from: f32,
+    to: f32,
+    threshold: f32,
+}
+
+pub type TrackTriggeringJobRef<'t> = TrackTriggeringJob<&'t Track<f32>>;
+pub type TrackTriggeringJobRc = TrackTriggeringJob<Rc<Track<f32>>>;
+pub type TrackTriggeringJobArc = TrackTriggeringJob<Arc<Track<f32>>>;
+
+impl<T> Default for TrackTriggeringJob<T>
+where
+    T: OzzObj<Track<f32>>,
+{
+    fn default() -> TrackTriggeringJob<T> {
+        return TrackTriggeringJob {
+            track: None,
+            from: 0.0,
+            to: 0.0,
+            threshold: 0.0,
+        };
+    }
+}
+
+impl<T> TrackTriggeringJob<T>
+where
+    T: OzzObj<Track<f32>>,
+{
+    /// Gets track of `TrackTriggeringJob`.
+    #[inline]
+    pub fn track(&self) -> Option<&T> {
+        return self.track.as_ref();
+    }
+
+    /// Sets track of `TrackTriggeringJob`.
+    ///
+    /// Track to sample.
+    #[inline]
+    pub fn set_track(&mut self, track: T) {
+        self.track = Some(track);
+    }
+
+    /// Clears track of `TrackTriggeringJob`.
+    #[inline]
+    pub fn clear_track(&mut self) {
+        self.track = None;
+    }
+
+    /// Gets from of `TrackTriggeringJob`.
+    #[inline]
+    pub fn from(&self) -> f32 {
+        return self.from;
+    }
+
+    /// Sets from of `TrackTriggeringJob`.
+    ///
+    /// Input range. 0 is the beginning of the track, 1 is the end.
+    ///
+    /// `from` can be of any sign, any order, and any range. The job will perform accordingly:
+    ///
+    /// - If difference between `from` and `to` is greater than 1, the iterator will loop multiple
+    ///   times on the track.
+    /// - If `from` is greater than `to`, then the track is processed backward (rising edges in
+    ///   forward become falling ones).
+    #[inline]
+    pub fn set_from(&mut self, from: f32) {
+        self.from = from;
+    }
+
+    /// Gets to of `TrackTriggeringJob`.
+    #[inline]
+    pub fn to(&self) -> f32 {
+        return self.to;
+    }
+
+    /// Sets to of `TrackTriggeringJob`.
+    ///
+    /// Input range. 0 is the beginning of the track, 1 is the end.
+    ///
+    /// `to` can be of any sign, any order, and any range. The job will perform accordingly:
+    ///
+    /// - If difference between `from` and `to` is greater than 1, the iterator will loop multiple
+    ///   times on the track.
+    /// - If `from` is greater than `to`, then the track is processed backward (rising edges in
+    ///   forward become falling ones).
+    #[inline]
+    pub fn set_to(&mut self, to: f32) {
+        self.to = to;
+    }
+
+    /// Gets threshold of `TrackTriggeringJob`.
+    #[inline]
+    pub fn threshold(&self) -> f32 {
+        return self.threshold;
+    }
+
+    /// Sets threshold of `TrackTriggeringJob`.
+    ///
+    /// Edge detection threshold value.
+    ///
+    /// A rising edge is detected as soon as the track value becomes greater than the threshold.
+    ///
+    /// A falling edge is detected as soon as the track value becomes smaller or equal than the threshold.
+    #[inline]
+    pub fn set_threshold(&mut self, threshold: f32) {
+        self.threshold = threshold;
+    }
+
+    /// Validates `TrackTriggeringJob` parameters.
+    #[inline]
+    pub fn validate(&self) -> bool {
+        return self.track.is_some();
+    }
+
+    /// Runs track triggering job's task.
+    /// The validate job before any operation is performed.
+    ///
+    /// Returns an iterator of `Edge` that represents the detected edges.
+    pub fn run<'t>(&'t mut self) -> Result<TrackTriggeringIter<'t, T>, OzzError> {
+        if !self.track.is_some() {
+            return Err(OzzError::InvalidJob);
+        }
+        return Ok(TrackTriggeringIter::new(self));
+    }
+}
+
+#[derive(Debug)]
+pub struct TrackTriggeringIter<'t, T>
+where
+    T: OzzObj<Track<f32>>,
+{
+    job: &'t TrackTriggeringJob<T>,
+    track: Option<&'t Track<f32>>, // also used as end marker
+    outer: f32,
+    inner: isize,
+}
+
+impl<'t, T> TrackTriggeringIter<'t, T>
+where
+    T: OzzObj<Track<f32>>,
+{
+    fn new(job: &'t TrackTriggeringJob<T>) -> TrackTriggeringIter<'t, T> {
+        let track = job.track().unwrap().obj();
+        let end = job.from == job.to;
+        return TrackTriggeringIter {
+            job: job,
+            track: if end { None } else { Some(track) },
+            outer: job.from.floor(),
+            inner: if job.from < job.to {
+                0
+            } else {
+                track.key_count() as isize - 1
+            },
+        };
+    }
+
+    fn detect_edge(&self, it0: usize, it1: usize, forward: bool) -> Option<Edge> {
+        let track = self.track.unwrap();
+        let val0 = track.values()[it0];
+        let val1 = track.values()[it1];
+
+        let mut detected = false;
+        let mut edge = Edge::default();
+        if val0 <= self.job.threshold && val1 > self.job.threshold {
+            // rising edge
+            edge.rising = forward;
+            detected = true;
+        } else if val0 > self.job.threshold && val1 <= self.job.threshold {
+            // falling edge
+            edge.rising = !forward;
+            detected = true;
+        }
+
+        if !detected {
+            return None;
+        }
+
+        let step = (track.steps()[it0 / 8] & (1 << (it0 & 7))) != 0;
+        if step {
+            edge.ratio = track.ratios()[it1];
+        } else {
+            if it1 == 0 {
+                edge.ratio = 0.0;
+            } else {
+                let alpha = (self.job.threshold - val0) / (val1 - val0);
+                let ratio0 = track.ratios()[it0];
+                let ratio1 = track.ratios()[it1];
+                edge.ratio = ratio0 + (ratio1 - ratio0) * alpha;
+            }
+        }
+        return Some(edge);
+    }
+}
+
+impl<'t, T> Iterator for TrackTriggeringIter<'t, T>
+where
+    T: OzzObj<Track<f32>>,
+{
+    type Item = Edge;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let track = self.track?;
+
+        let key_count = track.key_count() as isize;
+        if self.job.to > self.job.from {
+            // from => to
+            while self.outer < self.job.to {
+                while self.inner < key_count {
+                    let it0 = if self.inner == 0 { key_count - 1 } else { self.inner - 1 };
+                    if let Some(mut edge) = self.detect_edge(it0 as usize, self.inner as usize, true) {
+                        edge.ratio += self.outer;
+                        if edge.ratio >= self.job.from && (edge.ratio < self.job.to || self.job.to >= 1.0 + self.outer)
+                        {
+                            self.inner += 1;
+                            return Some(edge);
+                        }
+                    }
+                    // no edge found
+                    if track.ratios()[self.inner as usize] + self.outer >= self.job.to {
+                        break;
+                    }
+                    self.inner += 1;
+                }
+                self.inner = 0;
+                self.outer += 1.0;
+            }
+        } else {
+            // to => from
+            while self.outer + 1.0 > self.job.to {
+                while self.inner >= 0 {
+                    let it0 = if self.inner == 0 { key_count - 1 } else { self.inner - 1 };
+                    if let Some(mut edge) = self.detect_edge(it0 as usize, self.inner as usize, false) {
+                        edge.ratio += self.outer;
+                        if edge.ratio >= self.job.to
+                            && (edge.ratio < self.job.from || self.job.from >= 1.0 + self.outer)
+                        {
+                            self.inner -= 1;
+                            return Some(edge);
+                        }
+                    }
+                    // no edge found
+                    if track.ratios()[self.inner as usize] + self.outer <= self.job.to {
+                        break;
+                    }
+                    self.inner -= 1;
+                }
+                self.inner = key_count - 1;
+                self.outer -= 1.0;
+            }
+        }
+
+        // iterator end
+        self.track = None;
+        return None;
+    }
+}
+