diff --git a/ovgenpy/channel.py b/ovgenpy/channel.py
index ae9f137..38c325f 100644
--- a/ovgenpy/channel.py
+++ b/ovgenpy/channel.py
@@ -41,7 +41,7 @@ class Channel:
         )
         self.trigger = tcfg(
             wave=self.wave,
-            scan_nsamp=trigger_nsamp,  # TODO rename to trigger_nsamp
-            # FIXME self.trigger_subsampling
+            nsamp=trigger_nsamp,
+            subsampling=ovgen_cfg.subsampling * self.trigger_subsampling
         )
 
diff --git a/ovgenpy/triggers.py b/ovgenpy/triggers.py
index ba7f5a9..11eb356 100644
--- a/ovgenpy/triggers.py
+++ b/ovgenpy/triggers.py
@@ -1,6 +1,5 @@
-import weakref
 from abc import ABC, abstractmethod
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Type
 
 import numpy as np
 from scipy import signal
@@ -14,10 +13,31 @@ if TYPE_CHECKING:
     from ovgenpy.wave import Wave
 
 
+class ITriggerConfig:
+    cls: Type['Trigger']
+
+    def __call__(self, wave: 'Wave', nsamp: int, subsampling: int):
+        return self.cls(wave, cfg=self, nsamp=nsamp, subsampling=subsampling)
+
+
+def register_trigger(config_t: Type[ITriggerConfig]):
+    """ @register_trigger(FooTriggerConfig)
+    def FooTrigger(): ...
+    """
+    def inner(trigger_t: Type[Trigger]):
+        config_t.cls = trigger_t
+        return trigger_t
+
+    return inner
+
+
 class Trigger(ABC):
-    def __init__(self, wave: 'Wave', scan_nsamp: int):
-        self._wave: Wave = weakref.proxy(wave)
-        self._scan_nsamp = scan_nsamp
+    def __init__(self, wave: 'Wave', cfg: ITriggerConfig, nsamp: int, subsampling: int):
+        self.cfg = cfg
+        self._wave = wave
+
+        self._trigger_nsamp = nsamp
+        self._trigger_subsampling = subsampling
 
     @abstractmethod
     def get_trigger(self, index: int) -> int:
@@ -28,14 +48,6 @@ class Trigger(ABC):
         ...
 
 
-class ITriggerConfig:
-    def __call__(self, wave: 'Wave', scan_nsamp: int):
-        # idea: __call__ return self.cls(wave, scan_nsamp, cfg=self)
-        # problem: cannot reference XTrigger from within XTrigger
-        # solution: @register_trigger(XTriggerCfg)
-        raise NotImplementedError
-
-
 def lerp(x: np.ndarray, y: np.ndarray, a: float):
     return x * (1 - a) + y * a
 
@@ -50,36 +62,31 @@ class CorrelationTriggerConfig(ITriggerConfig):
     responsiveness: float
     falloff_width: float
 
-    def __call__(self, wave: 'Wave', scan_nsamp: int):
-        return CorrelationTrigger(wave, scan_nsamp, cfg=self)
-
 
+@register_trigger(CorrelationTriggerConfig)
 class CorrelationTrigger(Trigger):
     MIN_AMPLITUDE = 0.01
-    # get_trigger postprocessing: self._zero_trigger
     ZERO_CROSSING_SCAN = 256
+    cfg: CorrelationTriggerConfig
 
-    def __init__(self, wave: 'Wave', scan_nsamp: int, cfg: CorrelationTriggerConfig):
+    def __init__(self, *args, **kwargs):
         """
-        Correlation-based trigger which looks at a window of `scan_nsamp` samples.
-
+        Correlation-based trigger which looks at a window of `trigger_nsamp` samples.
         it's complicated
-
-        :param wave: Wave file
-        :param scan_nsamp: Number of samples used to align adjacent frames
-        :param cfg: Correlation config
         """
-        Trigger.__init__(self, wave, scan_nsamp)
-        self._buffer_nsamp = self._scan_nsamp
-
-        # Correlation config
-        self.cfg = cfg
+        Trigger.__init__(self, *args, **kwargs)
+        self._buffer_nsamp = self._trigger_nsamp
 
         # Create correlation buffer (containing a series of old data)
-        self._buffer = np.zeros(scan_nsamp, dtype=FLOAT)    # type: np.ndarray[FLOAT]
+        self._buffer = np.zeros(self._buffer_nsamp, dtype=FLOAT)    # type: np.ndarray[FLOAT]
 
         # Create zero crossing trigger, for postprocessing results
-        self._zero_trigger = ZeroCrossingTrigger(wave, self.ZERO_CROSSING_SCAN)
+        self._zero_trigger = ZeroCrossingTrigger(
+            self._wave,
+            ITriggerConfig(),
+            nsamp=self.ZERO_CROSSING_SCAN,
+            subsampling=1,
+        )
 
     def get_trigger(self, index: int) -> int:
         """
@@ -199,11 +206,8 @@ def get_period(data: np.ndarray) -> int:
 
 
 class ZeroCrossingTrigger(Trigger):
-    def __init__(self, wave: 'Wave', scan_nsamp: int):
-        super().__init__(wave, scan_nsamp)
-
     def get_trigger(self, index: int):
-        scan_nsamp = self._scan_nsamp
+        trigger_nsamp = self._trigger_nsamp
 
         if not 0 <= index < self._wave.nsamp:
             return index
@@ -219,7 +223,7 @@ class ZeroCrossingTrigger(Trigger):
         else:   # self._wave[sample] == 0
             return index + 1
 
-        data = self._wave[index : index + (direction * scan_nsamp) : direction]
+        data = self._wave[index : index + (direction * trigger_nsamp) : direction]
         intercepts = find(data, test)
         try:
             (delta,), value = next(intercepts)
diff --git a/ovgenpy/wave.py b/ovgenpy/wave.py
index e87747a..56bc236 100644
--- a/ovgenpy/wave.py
+++ b/ovgenpy/wave.py
@@ -5,7 +5,7 @@ from ovgenpy.config import dataclass
 from scipy.io import wavfile
 
 
-# Internal class, not exposed via YAML (TODO replace with ChannelConfig?)
+# Internal class, not exposed via YAML
 @dataclass
 class _WaveConfig:
     amplification: float = 1
diff --git a/tests/test_trigger.py b/tests/test_trigger.py
index 9700285..6962fed 100644
--- a/tests/test_trigger.py
+++ b/tests/test_trigger.py
@@ -23,14 +23,14 @@ def cfg(request):
     )
 
 
-def test_trigger(cfg):
+def test_trigger(cfg: CorrelationTriggerConfig):
     # wave = Wave(None, 'tests/sine440.wav')
     wave = Wave(None, 'tests/impulse24000.wav')
 
     iters = 5
     plot = False
     x = 24000 - 500
-    trigger = cfg(wave, 4000)
+    trigger = cfg(wave, 4000, subsampling=1)
 
     if plot:
         BIG = 0.95