Add pulse, noise, PWM slow, PWM fast audio demos

Every waveform on the synths page now has an audio player.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/generate_audio.py

@@ -448,6 +448,22 @@ def gen_synth_acoustic_guitar():
         p.strum(ch, Duration.WHOLE, velocity=75)
     render("synth_acoustic_guitar", score)
 
+def gen_synth_pulse():
+    _synth_demo("pulse", "pulse")
+
+def gen_synth_noise():
+    score = Score("4/4", bpm=100)
+    p = score.part("demo", synth="noise", envelope="pad", volume=0.3,
+                   lowpass=2000, reverb=0.3)
+    p.add("C4", Duration.WHOLE * 2, velocity=80)
+    render("synth_noise", score)
+
+def gen_synth_pwm_slow():
+    _synth_demo("pwm_slow", "pwm_slow", envelope="pad")
+
+def gen_synth_pwm_fast():
+    _synth_demo("pwm_fast", "pwm_fast")
+
 def gen_synth_fm():
     _synth_demo("fm", "fm", envelope="piano")
 
@@ -802,6 +818,10 @@ GENERATORS = [
     gen_synth_saw,
     gen_synth_triangle,
     gen_synth_square,
+    gen_synth_pulse,
+    gen_synth_noise,
+    gen_synth_pwm_slow,
+    gen_synth_pwm_fast,
     gen_synth_fm,
     gen_synth_supersaw,
     gen_synth_piano,

docs/guide/synths.rst

@@ -114,6 +114,10 @@ the classic NES-style buzzy tone.
 
    lead = score.part("lead", synth="pulse", envelope="pluck")
 
+.. raw:: html
+
+   <audio controls style="width:100%;margin:0.3em 0 0.5em"><source src="../_static/audio/synth_pulse.wav" type="audio/wav"></audio>
+
 FM Synthesis
 ~~~~~~~~~~~~
 
@@ -162,6 +166,10 @@ Useful as a texture layer, a percussion source, or a wind/ocean effect.
        lowpass=2000,
    )
 
+.. raw:: html
+
+   <audio controls style="width:100%;margin:0.3em 0 0.5em"><source src="../_static/audio/synth_noise.wav" type="audio/wav"></audio>
+
 Ensemble Waveforms
 ------------------
 
@@ -219,6 +227,10 @@ from Boards of Canada to Drake? PWM with a slow LFO.
        reverb=0.4,
    )
 
+.. raw:: html
+
+   <audio controls style="width:100%;margin:0.3em 0 0.5em"><source src="../_static/audio/synth_pwm_slow.wav" type="audio/wav"></audio>
+
 PWM Fast
 ~~~~~~~~
 
@@ -231,6 +243,10 @@ produces a natural chorus/vibrato effect built into the waveform itself.
 
    lead = score.part("lead", synth="pwm_fast", envelope="pluck", volume=0.5)
 
+.. raw:: html
+
+   <audio controls style="width:100%;margin:0.3em 0 0.5em"><source src="../_static/audio/synth_pwm_fast.wav" type="audio/wav"></audio>
+
 ADSR Envelopes
 --------------