diff --git a/crates/tek_core/src/time.rs b/crates/tek_core/src/time.rs
index f92730b8..d26fb0b9 100644
--- a/crates/tek_core/src/time.rs
+++ b/crates/tek_core/src/time.rs
@@ -256,35 +256,19 @@ impl PulsesPerQuaver<f64> for Instant {
 }
 impl SamplePosition<usize> for Instant {
     #[inline] fn sample (&self) -> usize { self.sample.load(Ordering::Relaxed) }
-    #[inline] fn set_sample (&self, sample: usize) {
-        self.sample.store(sample, Ordering::Relaxed);
-        self.set_usec(self.timebase.samples_to_usec(sample as f64) as usize);
-        self.set_pulse(self.timebase.samples_to_pulse(sample as f64));
-    }
+    #[inline] fn set_sample (&self, s: usize) { self.sample.store(s, Ordering::Relaxed); }
 }
 impl UsecPosition<usize> for Instant {
     #[inline] fn usec (&self) -> usize { self.usec.load(Ordering::Relaxed) }
-    #[inline] fn set_usec (&self, usec: usize) {
-        self.usec.store(usec, Ordering::Relaxed);
-        self.set_pulse(self.timebase.usecs_to_pulse(usec as f64));
-        // FIXME: segfault!?!
-        //self.set_sample(self.timebase.usecs_to_sample(usec as f64) as usize);
-    }
+    #[inline] fn set_usec (&self, u: usize) { self.usec.store(u, Ordering::Relaxed); }
 }
 impl PulsePosition<f64> for Instant {
     #[inline] fn pulse (&self) -> f64 { self.pulse.load(Ordering::Relaxed) }
-    #[inline] fn set_pulse (&self, pulse: f64) {
-        self.pulse.store(pulse, Ordering::Relaxed);
-        // FIXME: segfault!?!
-        //self.set_usec(self.timebase.pulses_to_usec(pulse) as usize);
-        //self.set_sample(self.timebase.pulses_to_sample(pulse) as usize);
-    }
+    #[inline] fn set_pulse (&self, p: f64) { self.pulse.store(p, Ordering::Relaxed); }
 }
 impl PulsePosition<usize> for Instant {
     #[inline] fn pulse (&self) -> usize { self.pulse.load(Ordering::Relaxed) as usize }
-    #[inline] fn set_pulse (&self, pulse: usize) {
-        PulsePosition::<f64>::set_pulse(self, pulse as f64)
-    }
+    #[inline] fn set_pulse (&self, p: usize) { PulsePosition::<f64>::set_pulse(self, p as f64) }
 }
 impl Instant {
     pub fn from_usec (timebase: &Arc<Timebase>, usec: usize) -> Self {
@@ -295,6 +279,11 @@ impl Instant {
             timebase: timebase.clone(),
         }
     }
+    pub fn update_from_usec (&self, usec: usize) {
+        self.set_usec(usec);
+        self.set_pulse(self.timebase.usecs_to_pulse(usec as f64));
+        self.set_sample(self.timebase.usecs_to_sample(usec as f64) as usize);
+    }
     pub fn from_sample (timebase: &Arc<Timebase>, sample: usize) -> Self {
         Self {
             sample:   sample.into(),
@@ -303,6 +292,11 @@ impl Instant {
             timebase: timebase.clone(),
         }
     }
+    pub fn update_from_sample (&self, sample: usize) {
+        self.set_sample(sample);
+        self.set_usec(self.timebase.samples_to_usec(sample as f64) as usize);
+        self.set_pulse(self.timebase.samples_to_pulse(sample as f64));
+    }
     pub fn from_pulse (timebase: &Arc<Timebase>, pulse: f64) -> Self {
         Self {
             pulse:    pulse.into(),
@@ -311,6 +305,11 @@ impl Instant {
             timebase: timebase.clone(),
         }
     }
+    pub fn update_from_pulse (&self, pulse: f64) {
+        self.set_pulse(pulse);
+        self.set_usec(self.timebase.pulses_to_usec(pulse) as usize);
+        self.set_sample(self.timebase.pulses_to_sample(pulse) as usize);
+    }
 }
 
 /// (pulses, name), assuming 96 PPQ