diff --git a/Makefile b/Makefile
index 6734e2e..0458764 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@ LDLIBS = -lm
 PYTHON = python3
 PLAY = ffplay -v fatal -nodisp -autoexit -f s32le -ar 48000 -ch_layout mono -i pipe:0
 
-effects = flanger echo fm phaser discont am distortion
+effects = flanger echo fm phaser discont am distortion tremolo
 flanger_defaults = 0.6 0.6 0.6 0.6
 echo_defaults = 0.3 0.3 0.3 0.3
 fm_defaults = 0.25 0.25 0.5 0.5
@@ -13,8 +13,9 @@ am_defaults = 0.5 0.5 0.5 0.5
 phaser_defaults = 0.3 0.3 0.5 0.5
 discont_defaults = 0.8 0.1 0.2 0.2
 distortion_defaults = 0.5 0.6 0.8 0.0
+tremolo_defaults = 0.5 0.7 0.0 0.0
 
-HEADERS = biquad.h discont.h distortion.h echo.h effect.h flanger.h  fm.h  gensin.h lfo.h  phaser.h  util.h process.h
+HEADERS = biquad.h discont.h distortion.h echo.h effect.h flanger.h fm.h gensin.h lfo.h phaser.h process.h tremolo.h util.h
 
 default:
 	@echo "Pick one of" $(effects)
diff --git a/convert.c b/convert.c
index 6bdeb49..c9e78bc 100644
--- a/convert.c
+++ b/convert.c
@@ -21,6 +21,7 @@
 #include "phaser.h"
 #include "discont.h"
 #include "distortion.h"
+#include "tremolo.h"
 
 static void magnitude_init(float pot1, float pot2, float pot3, float pot4) {}
 static float magnitude_step(float in) { return u32_to_fraction(magnitude); }
@@ -36,6 +37,7 @@ struct effect {
 	EFF(echo),
 	EFF(flanger),
 	EFF(phaser),
+	EFF(tremolo),
 
 	/* "Helper" effects */
 	EFF(am),
diff --git a/tremolo.h b/tremolo.h
new file mode 100644
index 0000000..2a660ce
--- /dev/null
+++ b/tremolo.h
@@ -0,0 +1,41 @@
+//
+// Tremolo effect - amplitude modulation via LFO
+//
+// Classic guitar amp tremolo effect that modulates volume
+// using a sine or triangle wave LFO.
+//
+static struct {
+	struct lfo_state lfo;
+	float depth;
+	enum lfo_type wave;
+} tremolo;
+
+static inline void tremolo_init(float pot1, float pot2, float pot3, float pot4)
+{
+	// pot1: LFO rate (0.5 - 15 Hz)
+	float rate = 0.5 + pot1 * 14.5;
+	set_lfo_freq(&tremolo.lfo, rate);
+
+	// pot2: depth (0 - 100%)
+	tremolo.depth = pot2;
+
+	// pot3: waveform (0-0.5 = sine, 0.5-1 = triangle)
+	tremolo.wave = pot3 < 0.5 ? lfo_sinewave : lfo_triangle;
+
+	fprintf(stderr, "tremolo:");
+	fprintf(stderr, " rate=%g Hz", rate);
+	fprintf(stderr, " depth=%g", pot2);
+	fprintf(stderr, " wave=%s\n", pot3 < 0.5 ? "sine" : "triangle");
+}
+
+static inline float tremolo_step(float in)
+{
+	// Get LFO value (-1 to 1), convert to gain multiplier
+	float lfo = lfo_step(&tremolo.lfo, tremolo.wave);
+
+	// Convert LFO to amplitude multiplier: 1 - depth*(1-lfo)/2
+	// When lfo=1, mult=1; when lfo=-1, mult=1-depth
+	float mult = 1.0f - tremolo.depth * (1.0f - lfo) * 0.5f;
+
+	return in * mult;
+}