diff --git a/.idea/inspectionProfiles/Project_Default.xml b/.idea/inspectionProfiles/Project_Default.xml
index 98803f3..3cf2845 100644
--- a/.idea/inspectionProfiles/Project_Default.xml
+++ b/.idea/inspectionProfiles/Project_Default.xml
@@ -17,6 +17,7 @@
           <option value="E302" />
           <option value="E203" />
           <option value="E128" />
+          <option value="E266" />
         </list>
       </option>
     </inspection_tool>
diff --git a/ovgenpy/channel.py b/ovgenpy/channel.py
index 42680ef..dd83629 100644
--- a/ovgenpy/channel.py
+++ b/ovgenpy/channel.py
@@ -30,41 +30,46 @@ class ChannelConfig:
 
 
 class Channel:
-    # Shared between trigger and renderer.
-    window_samp: int
+    # trigger_samp is unneeded, since __init__ (not Ovgenpy) constructs triggers.
+    render_samp: int
+    # TODO add a "get_around" method for rendering (also helps test_channel_subsampling)
+    # Currently Ovgenpy peeks at Chanel.render_samp and render_stride (bad).
 
     # Product of ovgen_cfg.subsampling and trigger/render_width.
-    trigger_subsampling: int
-    render_subsampling: int
+    trigger_stride: int
+    render_stride: int
 
     def __init__(self, cfg: ChannelConfig, ovgen_cfg: 'Config'):
         self.cfg = cfg
-        subsampling = ovgen_cfg.subsampling
 
         # Create a Wave object.
         wcfg = _WaveConfig(amplification=ovgen_cfg.amplification * cfg.ampl_ratio)
         self.wave = Wave(wcfg, abspath(cfg.wav_path))
 
-        # Compute subsampling (array stride).
+        # `subsampling` increases `stride` and decreases `nsamp`.
+        # `width` increases `stride` without changing `nsamp`.
+        tsub = ovgen_cfg.trigger_subsampling
         tw = coalesce(cfg.trigger_width, ovgen_cfg.trigger_width)
-        self.trigger_subsampling = subsampling * tw
 
+        rsub = ovgen_cfg.render_subsampling
         rw = coalesce(cfg.render_width, ovgen_cfg.render_width)
-        self.render_subsampling = subsampling * rw
 
-        # Compute window_samp and tsamp_frame.
-        nsamp = ovgen_cfg.render_width_s * self.wave.smp_s / subsampling
-        self.window_samp = round(nsamp)
+        # nsamp = orig / subsampling
+        # stride = subsampling * width
+        def calculate_nsamp(sub):
+            return round(ovgen_cfg.width_s * self.wave.smp_s / sub)
+        trigger_samp = calculate_nsamp(tsub)
+        self.render_samp = calculate_nsamp(rsub)
 
-        del subsampling
-        del nsamp
+        self.trigger_stride = tsub * tw
+        self.render_stride = rsub * rw
 
         # Create a Trigger object.
         tcfg = cfg.trigger or ovgen_cfg.trigger
         self.trigger = tcfg(
             wave=self.wave,
-            tsamp=self.window_samp,
-            subsampling=self.trigger_subsampling,
+            tsamp=trigger_samp,
+            subsampling=self.trigger_stride,
             fps=ovgen_cfg.fps
         )
 
diff --git a/ovgenpy/ovgenpy.py b/ovgenpy/ovgenpy.py
index aa0d7af..f8c8592 100644
--- a/ovgenpy/ovgenpy.py
+++ b/ovgenpy/ovgenpy.py
@@ -13,7 +13,7 @@ from ovgenpy.layout import LayoutConfig
 from ovgenpy.triggers import ITriggerConfig, CorrelationTriggerConfig, PerFrameCache
 from ovgenpy.util import pushd, coalesce
 from ovgenpy.utils import keyword_dataclasses as dc
-from ovgenpy.utils.keyword_dataclasses import field
+from ovgenpy.utils.keyword_dataclasses import field, InitVar
 from ovgenpy.wave import Wave
 
 if TYPE_CHECKING:
@@ -39,7 +39,12 @@ class Config:
     end_time: float = None
 
     width_ms: int
-    subsampling: int = 1
+
+    # trigger_subsampling and render_subsampling override subsampling.
+    trigger_subsampling: int = None
+    render_subsampling: int = None
+    subsampling: InitVar[int] = 1
+
     trigger_width: int = 1
     render_width: int = 1
 
@@ -65,10 +70,11 @@ class Config:
     # endregion
 
     @property
-    def render_width_s(self) -> float:
+    def width_s(self) -> float:
         return self.width_ms / 1000
 
-    def __post_init__(self):
+    def __post_init__(self, subsampling):
+        # Cast benchmark_mode to enum.
         try:
             if not isinstance(self.benchmark_mode, BenchmarkMode):
                 self.benchmark_mode = BenchmarkMode[self.benchmark_mode]
@@ -77,6 +83,10 @@ class Config:
                 f'invalid benchmark_mode mode {self.benchmark_mode} not in '
                 f'{[el.name for el in BenchmarkMode]}')
 
+        # Compute trigger_subsampling and render_subsampling.
+        self.trigger_subsampling = coalesce(self.trigger_subsampling, subsampling)
+        self.render_subsampling = coalesce(self.render_subsampling, subsampling)
+
 
 _FPS = 60  # f_s
 
@@ -87,6 +97,7 @@ def default_config(**kwargs):
         amplification=1,
 
         width_ms=40,
+        # FIXME add trigger_subsampling and render_subsampling
         subsampling=2,
         trigger=CorrelationTriggerConfig(
             edge_strength=2,
@@ -212,7 +223,7 @@ class Ovgen:
                     print(rounded)
                     prev = rounded
 
-                datas = []
+                render_datas = []
                 # Get data from each wave
                 for wave, channel in zip(self.waves, self.channels):
                     sample = round(wave.smp_s * time_seconds)
@@ -223,8 +234,8 @@ class Ovgen:
                     else:
                         trigger_sample = sample
 
-                    datas.append(wave.get_around(
-                        trigger_sample, channel.window_samp, channel.render_subsampling))
+                    render_datas.append(wave.get_around(
+                        trigger_sample, channel.render_samp, channel.render_stride))
 
                 # region Display buffers, for debugging purposes.
                 if extra_outputs.window:
@@ -240,7 +251,7 @@ class Ovgen:
 
                 if not_benchmarking or benchmark_mode >= BenchmarkMode.RENDER:
                     # Render frame
-                    renderer.render_frame(datas)
+                    renderer.render_frame(render_datas)
                     frame = renderer.get_frame()
 
                     if not_benchmarking or benchmark_mode == BenchmarkMode.OUTPUT:
diff --git a/tests/test_channel.py b/tests/test_channel.py
index fe161cc..9ee6d8a 100644
--- a/tests/test_channel.py
+++ b/tests/test_channel.py
@@ -1,7 +1,9 @@
+from typing import Optional
+
 import numpy as np
 import pytest
-from hypothesis import given, reproduce_failure
-from hypothesis.strategies import integers
+from hypothesis import given
+import hypothesis.strategies as hs
 from pytest_mock import MockFixture
 
 import ovgenpy.channel
@@ -9,21 +11,25 @@ import ovgenpy.ovgenpy
 from ovgenpy.channel import ChannelConfig, Channel
 from ovgenpy.ovgenpy import default_config, Ovgen, BenchmarkMode
 from ovgenpy.triggers import NullTriggerConfig
+from ovgenpy.util import coalesce
 
-assert reproduce_failure
+positive = hs.integers(min_value=1, max_value=100)
+maybe = hs.one_of(positive, hs.none())
 
-
-positive = integers(min_value=1, max_value=100)
-
-@given(subsampling=positive, trigger_width=positive, render_width=positive)
+@given(subsampling=positive, tsub=maybe, rsub=maybe,
+       trigger_width=positive, render_width=positive)
 def test_channel_subsampling(
-    subsampling: int,
-    trigger_width: int,
-    render_width: int,
-    mocker: MockFixture
+        subsampling: int,
+        tsub: Optional[int],
+        rsub: Optional[int],
+        trigger_width: int,
+        render_width: int,
+        mocker: MockFixture
 ):
-    """ Ensure window_samp and trigger/render subsampling are computed correctly. """
+    """ Ensure trigger/render_samp and trigger/render subsampling
+    are computed correctly. """
 
+    # region setup test variables
     ovgenpy.ovgenpy.PRINT_TIMESTAMP = False    # Cleanup Hypothesis testing logs
 
     Wave = mocker.patch.object(ovgenpy.channel, 'Wave')
@@ -44,39 +50,50 @@ def test_channel_subsampling(
     cfg = default_config(
         channels=[ccfg],
         subsampling=subsampling,
+        trigger_subsampling=tsub,
+        render_subsampling=rsub,
         trigger=NullTriggerConfig(),
         benchmark_mode=BenchmarkMode.OUTPUT
     )
     channel = Channel(ccfg, cfg)
+    # endregion
 
     # Ensure channel.window_samp, trigger_subsampling, render_subsampling are correct.
-    ideal_nsamp = pytest.approx(
-        round(cfg.render_width_s * channel.wave.smp_s / subsampling), 1)
+    tsub = coalesce(tsub, subsampling)
+    rsub = coalesce(rsub, subsampling)
 
-    assert channel.window_samp == ideal_nsamp
-    assert channel.trigger_subsampling == subsampling * trigger_width
-    assert channel.render_subsampling == subsampling * render_width
+    def ideal_samp(sub):
+        return pytest.approx(
+            round(cfg.width_s * channel.wave.smp_s / sub), abs=1)
 
-    # Ensure trigger uses channel.window_samp and trigger_subsampling.
+    ideal_tsamp = ideal_samp(tsub)
+    ideal_rsamp = ideal_samp(rsub)
+    assert channel.render_samp == ideal_rsamp
+    del subsampling
+
+    assert channel.trigger_stride == tsub * trigger_width
+    assert channel.render_stride == rsub * render_width
+
+    ## Ensure trigger uses channel.window_samp and trigger_stride.
     trigger = channel.trigger
-    assert trigger._tsamp == channel.window_samp
-    assert trigger._subsampling == channel.trigger_subsampling
+    assert trigger._tsamp == ideal_tsamp
+    assert trigger._subsampling == channel.trigger_stride
 
-    # Ensure ovgenpy calls render using channel.window_samp and render_subsampling.
+    ## Ensure ovgenpy calls render using channel.render_samp and render_stride.
     ovgen = Ovgen(cfg, '.', outputs=[])
     renderer = mocker.patch.object(Ovgen, '_load_renderer').return_value
     ovgen.play()
 
-    # Inspect arguments to wave.get_around()
+    # Only render (not NullTrigger) calls wave.get_around().
     (_sample, _region_nsamp, _subsampling), kwargs = wave.get_around.call_args
-    assert _region_nsamp == channel.window_samp
-    assert _subsampling == channel.render_subsampling
+    assert _region_nsamp == channel.render_samp
+    assert _subsampling == channel.render_stride
 
     # Inspect arguments to renderer.render_frame()
     # datas: List[np.ndarray]
     (datas,), kwargs = renderer.render_frame.call_args
     render_data = datas[0]
-    assert len(render_data) == channel.window_samp
+    assert len(render_data) == channel.render_samp
 
 
 # line_color is tested in test_renderer.py