diff --git a/docs/_static/audio/complete_rock.wav b/docs/_static/audio/complete_rock.wav
index b3c11d4..74273fd 100644
Binary files a/docs/_static/audio/complete_rock.wav and b/docs/_static/audio/complete_rock.wav differ
diff --git a/docs/_static/audio/synth_saw.wav b/docs/_static/audio/synth_saw.wav
index 2acc0d9..588585b 100644
Binary files a/docs/_static/audio/synth_saw.wav and b/docs/_static/audio/synth_saw.wav differ
diff --git a/docs/_static/audio/synth_sine.wav b/docs/_static/audio/synth_sine.wav
index fcbe6cb..8a77221 100644
Binary files a/docs/_static/audio/synth_sine.wav and b/docs/_static/audio/synth_sine.wav differ
diff --git a/docs/_static/audio/synth_square.wav b/docs/_static/audio/synth_square.wav
index 4000560..a4c35e4 100644
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diff --git a/docs/_static/audio/synth_triangle.wav b/docs/_static/audio/synth_triangle.wav
index 847fe11..49c9a08 100644
Binary files a/docs/_static/audio/synth_triangle.wav and b/docs/_static/audio/synth_triangle.wav differ
diff --git a/docs/generate_audio.py b/docs/generate_audio.py
index 7c2aada..97ac387 100644
--- a/docs/generate_audio.py
+++ b/docs/generate_audio.py
@@ -393,7 +393,7 @@ def gen_jazz_ballad():
 
 # ── Synth waveform demos ──────────────────────────────────────────────────
 
-def _synth_demo(name, synth, envelope="pluck", **kwargs):
+def _synth_demo(name, synth, envelope="none", **kwargs):
     """Short C major melody on a given synth."""
     score = Score("4/4", bpm=100)
     p = score.part("demo", synth=synth, envelope=envelope, volume=0.5,
@@ -694,7 +694,7 @@ def gen_complete_rock():
     lead = score.part("lead", synth="saw", envelope="pluck", volume=0.4,
                       delay=0.2, delay_time=0.33, reverb=0.2, lowpass=3000)
     bass = score.part("bass", synth="triangle", envelope="pluck", volume=0.45,
-                      lowpass=600)
+                      lowpass=1200)
     for chord in Key("G", "major").progression("I", "V", "vi", "IV") * 2:
         piano.add(chord, Duration.WHOLE)
     lead.add("D5", 1).add("B4", 0.5).add("D5", 0.5)
diff --git a/docs/guide/sequencing.rst b/docs/guide/sequencing.rst
index d7875b3..eac06d8 100644
--- a/docs/guide/sequencing.rst
+++ b/docs/guide/sequencing.rst
@@ -396,7 +396,7 @@ lead, and filtered bass:
 
    # Filtered bass
    bass = score.part("bass", synth="triangle", envelope="pluck",
-                     volume=0.45, lowpass=600)
+                     volume=0.45, lowpass=1200)
 
    for chord in Key("G", "major").progression("I", "V", "vi", "IV") * 2:
        piano.add(chord, Duration.WHOLE)