diff --git a/src/modules/module-filter-chain.c b/src/modules/module-filter-chain.c
index ebfcd20a6..7a60b2897 100644
--- a/src/modules/module-filter-chain.c
+++ b/src/modules/module-filter-chain.c
@@ -369,6 +369,24 @@ PW_LOG_TOPIC_STATIC(mod_topic, "mod." NAME);
  * The control value "Base", "M1" and "M2" are used to calculate
  * out = M2 * log2f(fabsf(in * M1)) / log2f(Base) for each sample.
  *
+ * ### Multiply
+ *
+ * The mult plugin can be used to multiply samples together.
+ *
+ * It has 8 input ports named "In 1" to "In 8" and an output port "Out".
+ *
+ * All input ports samples are multiplied together into the output. Unused input ports
+ * will be ignored and not cause overhead.
+ *
+ * ### Sine
+ *
+ * The sine plugin generates a sine wave.
+ *
+ * It has an output port "Out" and also a control output port "notify".
+ *
+ * "Freq", "Ampl", "Offset" and "Phase" can be used to control the sine wave
+ * frequence, amplitude, offset and phase.
+ *
  * ## SOFA filter
  *
  * There is an optional builtin SOFA filter available.
diff --git a/src/modules/module-filter-chain/builtin_plugin.c b/src/modules/module-filter-chain/builtin_plugin.c
index ab440e5cb..c7f5d22fe 100644
--- a/src/modules/module-filter-chain/builtin_plugin.c
+++ b/src/modules/module-filter-chain/builtin_plugin.c
@@ -41,6 +41,7 @@ struct builtin {
 	float gain;
 	float b0, b1, b2;
 	float a0, a1, a2;
+	float accum;
 };
 
 static void *builtin_instantiate(const struct fc_descriptor * Descriptor,
@@ -1528,6 +1529,149 @@ static const struct fc_descriptor log_desc = {
 	.cleanup = builtin_cleanup,
 };
 
+/* mult */
+static void mult_run(void * Instance, unsigned long SampleCount)
+{
+	struct builtin *impl = Instance;
+	int i, n_src = 0;
+	float *out = impl->port[0];
+	const void *src[8];
+
+	if (out == NULL)
+		return;
+
+	for (i = 0; i < 8; i++) {
+		float *in = impl->port[1+i];
+
+		if (in == NULL)
+			continue;
+
+		src[n_src++] = in;
+	}
+	dsp_ops_mult(dsp_ops, out, src, n_src, SampleCount);
+}
+
+static struct fc_port mult_ports[] = {
+	{ .index = 0,
+	  .name = "Out",
+	  .flags = FC_PORT_OUTPUT | FC_PORT_AUDIO,
+	},
+	{ .index = 1,
+	  .name = "In 1",
+	  .flags = FC_PORT_INPUT | FC_PORT_AUDIO,
+	},
+	{ .index = 2,
+	  .name = "In 2",
+	  .flags = FC_PORT_INPUT | FC_PORT_AUDIO,
+	},
+	{ .index = 3,
+	  .name = "In 3",
+	  .flags = FC_PORT_INPUT | FC_PORT_AUDIO,
+	},
+	{ .index = 4,
+	  .name = "In 4",
+	  .flags = FC_PORT_INPUT | FC_PORT_AUDIO,
+	},
+	{ .index = 5,
+	  .name = "In 5",
+	  .flags = FC_PORT_INPUT | FC_PORT_AUDIO,
+	},
+	{ .index = 6,
+	  .name = "In 6",
+	  .flags = FC_PORT_INPUT | FC_PORT_AUDIO,
+	},
+	{ .index = 7,
+	  .name = "In 7",
+	  .flags = FC_PORT_INPUT | FC_PORT_AUDIO,
+	},
+	{ .index = 8,
+	  .name = "In 8",
+	  .flags = FC_PORT_INPUT | FC_PORT_AUDIO,
+	},
+};
+
+static const struct fc_descriptor mult_desc = {
+	.name = "mult",
+	.flags = FC_DESCRIPTOR_SUPPORTS_NULL_DATA,
+
+	.n_ports = SPA_N_ELEMENTS(mult_ports),
+	.ports = mult_ports,
+
+	.instantiate = builtin_instantiate,
+	.connect_port = builtin_connect_port,
+	.run = mult_run,
+	.cleanup = builtin_cleanup,
+};
+
+#define M_PI_M2 ( M_PI + M_PI )
+
+/* sine */
+static void sine_run(void * Instance, unsigned long SampleCount)
+{
+	struct builtin *impl = Instance;
+	float *out = impl->port[0];
+	float *notify = impl->port[1];
+	float freq = impl->port[2][0];
+	float ampl = impl->port[3][0];
+	float offs = impl->port[5][0];
+	unsigned long n;
+
+	for (n = 0; n < SampleCount; n++) {
+		if (out != NULL)
+			out[n] = sin(impl->accum) * ampl + offs;
+		if (notify != NULL && n == 0)
+			notify[0] = sin(impl->accum) * ampl + offs;
+
+		impl->accum += M_PI_M2 * freq / impl->rate;
+		if (impl->accum >= M_PI_M2)
+			impl->accum -= M_PI_M2;
+	}
+}
+
+static struct fc_port sine_ports[] = {
+	{ .index = 0,
+	  .name = "Out",
+	  .flags = FC_PORT_OUTPUT | FC_PORT_AUDIO,
+	},
+	{ .index = 1,
+	  .name = "Notify",
+	  .flags = FC_PORT_OUTPUT | FC_PORT_CONTROL,
+	},
+	{ .index = 2,
+	  .name = "Freq",
+	  .flags = FC_PORT_INPUT | FC_PORT_CONTROL,
+	  .def = 440.0f, .min = 0.0f, .max = 1000000.0f
+	},
+	{ .index = 3,
+	  .name = "Ampl",
+	  .flags = FC_PORT_INPUT | FC_PORT_CONTROL,
+	  .def = 1.0, .min = 0.0f, .max = 10.0f
+	},
+	{ .index = 4,
+	  .name = "Phase",
+	  .flags = FC_PORT_INPUT | FC_PORT_CONTROL,
+	  .def = 0.0f, .min = -M_PI, .max = M_PI
+	},
+	{ .index = 5,
+	  .name = "Offset",
+	  .flags = FC_PORT_INPUT | FC_PORT_CONTROL,
+	  .def = 0.0f, .min = -10.0f, .max = 10.0f
+	},
+};
+
+static const struct fc_descriptor sine_desc = {
+	.name = "sine",
+	.flags = FC_DESCRIPTOR_SUPPORTS_NULL_DATA,
+
+	.n_ports = SPA_N_ELEMENTS(sine_ports),
+	.ports = sine_ports,
+
+	.instantiate = builtin_instantiate,
+	.connect_port = builtin_connect_port,
+	.run = sine_run,
+	.cleanup = builtin_cleanup,
+};
+
 static const struct fc_descriptor * builtin_descriptor(unsigned long Index)
 {
 	switch(Index) {
@@ -1569,6 +1713,10 @@ static const struct fc_descriptor * builtin_descriptor(unsigned long Index)
 		return &exp_desc;
 	case 18:
 		return &log_desc;
+	case 19:
+		return &mult_desc;
+	case 20:
+		return &sine_desc;
 	}
 	return NULL;
 }
diff --git a/src/modules/module-filter-chain/dsp-ops-c.c b/src/modules/module-filter-chain/dsp-ops-c.c
index 03b4bceb8..82d20b50c 100644
--- a/src/modules/module-filter-chain/dsp-ops-c.c
+++ b/src/modules/module-filter-chain/dsp-ops-c.c
@@ -83,6 +83,31 @@ void dsp_mix_gain_c(struct dsp_ops *ops,
 	}
 }
 
+static inline void dsp_mult1_c(struct dsp_ops *ops, void * SPA_RESTRICT dst,
+			const void * SPA_RESTRICT src, uint32_t n_samples)
+{
+	uint32_t i;
+	const float *s = src;
+	float *d = dst;
+	for (i = 0; i < n_samples; i++)
+		d[i] *= s[i];
+}
+
+void dsp_mult_c(struct dsp_ops *ops,
+		void * SPA_RESTRICT dst,
+		const void * SPA_RESTRICT src[],
+		uint32_t n_src, uint32_t n_samples)
+{
+	uint32_t i;
+	if (n_src == 0) {
+		dsp_clear_c(ops, dst, n_samples);
+	} else {
+		dsp_copy_c(ops, dst, src[0], n_samples);
+		for (i = 1; i < n_src; i++)
+			dsp_mult1_c(ops, dst, src[i], n_samples);
+	}
+}
+
 void dsp_biquad_run_c(struct dsp_ops *ops, struct biquad *bq,
 		float *out, const float *in, uint32_t n_samples)
 {
diff --git a/src/modules/module-filter-chain/dsp-ops.c b/src/modules/module-filter-chain/dsp-ops.c
index a66c8c663..56eafe868 100644
--- a/src/modules/module-filter-chain/dsp-ops.c
+++ b/src/modules/module-filter-chain/dsp-ops.c
@@ -28,6 +28,7 @@ static struct dsp_info dsp_table[] =
 		.funcs.biquad_run = dsp_biquad_run_c,
 		.funcs.sum = dsp_sum_avx,
 		.funcs.linear = dsp_linear_c,
+		.funcs.mult = dsp_mult_c,
 		.funcs.fft_new = dsp_fft_new_c,
 		.funcs.fft_free = dsp_fft_free_c,
 		.funcs.fft_run = dsp_fft_run_c,
@@ -43,6 +44,7 @@ static struct dsp_info dsp_table[] =
 		.funcs.biquad_run = dsp_biquad_run_c,
 		.funcs.sum = dsp_sum_sse,
 		.funcs.linear = dsp_linear_c,
+		.funcs.mult = dsp_mult_c,
 		.funcs.fft_new = dsp_fft_new_c,
 		.funcs.fft_free = dsp_fft_free_c,
 		.funcs.fft_run = dsp_fft_run_c,
@@ -57,6 +59,7 @@ static struct dsp_info dsp_table[] =
 		.funcs.biquad_run = dsp_biquad_run_c,
 		.funcs.sum = dsp_sum_c,
 		.funcs.linear = dsp_linear_c,
+		.funcs.mult = dsp_mult_c,
 		.funcs.fft_new = dsp_fft_new_c,
 		.funcs.fft_free = dsp_fft_free_c,
 		.funcs.fft_run = dsp_fft_run_c,
diff --git a/src/modules/module-filter-chain/dsp-ops.h b/src/modules/module-filter-chain/dsp-ops.h
index 8ccf07d18..676548025 100644
--- a/src/modules/module-filter-chain/dsp-ops.h
+++ b/src/modules/module-filter-chain/dsp-ops.h
@@ -40,6 +40,9 @@ struct dsp_ops_funcs {
 	void (*linear) (struct dsp_ops *ops,
 			float * dst, const float * SPA_RESTRICT src,
 			const float mult, const float add, uint32_t n_samples);
+	void (*mult) (struct dsp_ops *ops,
+			void * SPA_RESTRICT dst,
+			const void * SPA_RESTRICT src[], uint32_t n_src, uint32_t n_samples);
 };
 
 struct dsp_ops {
@@ -62,6 +65,7 @@ int dsp_ops_init(struct dsp_ops *ops);
 #define dsp_ops_biquad_run(ops,...)	(ops)->funcs.biquad_run(ops, __VA_ARGS__)
 #define dsp_ops_sum(ops,...)		(ops)->funcs.sum(ops, __VA_ARGS__)
 #define dsp_ops_linear(ops,...)		(ops)->funcs.linear(ops, __VA_ARGS__)
+#define dsp_ops_mult(ops,...)		(ops)->funcs.mult(ops, __VA_ARGS__)
 
 #define dsp_ops_fft_new(ops,...)	(ops)->funcs.fft_new(ops, __VA_ARGS__)
 #define dsp_ops_fft_free(ops,...)	(ops)->funcs.fft_free(ops, __VA_ARGS__)
@@ -86,6 +90,9 @@ void dsp_sum_##arch (struct dsp_ops *ops, float * SPA_RESTRICT dst, \
 #define MAKE_LINEAR_FUNC(arch) \
 void dsp_linear_##arch (struct dsp_ops *ops, float * SPA_RESTRICT dst, \
 	const float * SPA_RESTRICT src, const float mult, const float add, uint32_t n_samples)
+#define MAKE_MULT_FUNC(arch) \
+void dsp_mult_##arch(struct dsp_ops *ops, void * SPA_RESTRICT dst,	\
+	const void * SPA_RESTRICT src[], uint32_t n_src, uint32_t n_samples)
 
 #define MAKE_FFT_NEW_FUNC(arch) \
 void *dsp_fft_new_##arch(struct dsp_ops *ops, int32_t size, bool real)
@@ -110,6 +117,7 @@ MAKE_MIX_GAIN_FUNC(c);
 MAKE_BIQUAD_RUN_FUNC(c);
 MAKE_SUM_FUNC(c);
 MAKE_LINEAR_FUNC(c);
+MAKE_MULT_FUNC(c);
 
 MAKE_FFT_NEW_FUNC(c);
 MAKE_FFT_FREE_FUNC(c);