diff --git a/shared-bindings/audiomixer/MixerVoice.c b/shared-bindings/audiomixer/MixerVoice.c
index 321a192a9d23..f06f079414ce 100644
--- a/shared-bindings/audiomixer/MixerVoice.c
+++ b/shared-bindings/audiomixer/MixerVoice.c
@@ -13,6 +13,9 @@
 #include "py/objproperty.h"
 #include "py/runtime.h"
 #include "shared-bindings/util.h"
+#if CIRCUITPY_SYNTHIO
+#include "shared-module/synthio/block.h"
+#endif
 
 //| class MixerVoice:
 //|     """Voice objects used with Mixer
@@ -75,17 +78,18 @@ static mp_obj_t audiomixer_mixervoice_obj_stop(size_t n_args, const mp_obj_t *po
 }
 MP_DEFINE_CONST_FUN_OBJ_KW(audiomixer_mixervoice_stop_obj, 1, audiomixer_mixervoice_obj_stop);
 
-//|     level: float
-//|     """The volume level of a voice, as a floating point number between 0 and 1."""
+//|     level: synthio.BlockInput
+//|     """The volume level of a voice, as a floating point number between 0 and 1. If your board
+//|     does not support synthio, this property will only accept a float value.
+//|     """
 static mp_obj_t audiomixer_mixervoice_obj_get_level(mp_obj_t self_in) {
-    return mp_obj_new_float(common_hal_audiomixer_mixervoice_get_level(self_in));
+    return common_hal_audiomixer_mixervoice_get_level(self_in);
 }
 MP_DEFINE_CONST_FUN_OBJ_1(audiomixer_mixervoice_get_level_obj, audiomixer_mixervoice_obj_get_level);
 
 static mp_obj_t audiomixer_mixervoice_obj_set_level(mp_obj_t self_in, mp_obj_t level_in) {
     audiomixer_mixervoice_obj_t *self = MP_OBJ_TO_PTR(self_in);
-    mp_float_t level = mp_arg_validate_obj_float_range(level_in, 0, 1, MP_QSTR_level);
-    common_hal_audiomixer_mixervoice_set_level(self, level);
+    common_hal_audiomixer_mixervoice_set_level(self, level_in);
     return mp_const_none;
 }
 MP_DEFINE_CONST_FUN_OBJ_2(audiomixer_mixervoice_set_level_obj, audiomixer_mixervoice_obj_set_level);
diff --git a/shared-bindings/audiomixer/MixerVoice.h b/shared-bindings/audiomixer/MixerVoice.h
index 9007911b78cb..cf6643d995c0 100644
--- a/shared-bindings/audiomixer/MixerVoice.h
+++ b/shared-bindings/audiomixer/MixerVoice.h
@@ -15,8 +15,8 @@ void common_hal_audiomixer_mixervoice_construct(audiomixer_mixervoice_obj_t *sel
 void common_hal_audiomixer_mixervoice_set_parent(audiomixer_mixervoice_obj_t *self, audiomixer_mixer_obj_t *parent);
 void common_hal_audiomixer_mixervoice_play(audiomixer_mixervoice_obj_t *self, mp_obj_t sample, bool loop);
 void common_hal_audiomixer_mixervoice_stop(audiomixer_mixervoice_obj_t *self);
-mp_float_t common_hal_audiomixer_mixervoice_get_level(audiomixer_mixervoice_obj_t *self);
-void common_hal_audiomixer_mixervoice_set_level(audiomixer_mixervoice_obj_t *self, mp_float_t gain);
+mp_obj_t common_hal_audiomixer_mixervoice_get_level(audiomixer_mixervoice_obj_t *self);
+void common_hal_audiomixer_mixervoice_set_level(audiomixer_mixervoice_obj_t *self, mp_obj_t gain);
 
 bool common_hal_audiomixer_mixervoice_get_playing(audiomixer_mixervoice_obj_t *self);
 
diff --git a/shared-module/audiomixer/Mixer.c b/shared-module/audiomixer/Mixer.c
index f086e78323be..ce3f1d79f2fb 100644
--- a/shared-module/audiomixer/Mixer.c
+++ b/shared-module/audiomixer/Mixer.c
@@ -188,9 +188,18 @@ static void mix_down_one_voice(audiomixer_mixer_obj_t *self,
             }
         }
 
-        uint32_t n = MIN(voice->buffer_length, length);
         uint32_t *src = voice->remaining_buffer;
+
+        #if CIRCUITPY_SYNTHIO
+        uint32_t n = MIN(MIN(voice->buffer_length, length), SYNTHIO_MAX_DUR * self->channel_count);
+
+        // Get the current level from the BlockInput. These may change at run time so you need to do bounds checking if required.
+        shared_bindings_synthio_lfo_tick(self->sample_rate);
+        uint16_t level = (uint16_t)(synthio_block_slot_get_limited(&voice->level, MICROPY_FLOAT_CONST(0.0), MICROPY_FLOAT_CONST(1.0)) * (1 << 15));
+        #else
+        uint32_t n = MIN(voice->buffer_length, length);
         uint16_t level = voice->level;
+        #endif
 
         // First active voice gets copied over verbatim.
         if (!voices_active) {
diff --git a/shared-module/audiomixer/MixerVoice.c b/shared-module/audiomixer/MixerVoice.c
index 66a47c269b48..49a88639d395 100644
--- a/shared-module/audiomixer/MixerVoice.c
+++ b/shared-module/audiomixer/MixerVoice.c
@@ -15,19 +15,27 @@
 
 void common_hal_audiomixer_mixervoice_construct(audiomixer_mixervoice_obj_t *self) {
     self->sample = NULL;
-    self->level = 1 << 15;
+    common_hal_audiomixer_mixervoice_set_level(self, mp_obj_new_float(1.0));
 }
 
 void common_hal_audiomixer_mixervoice_set_parent(audiomixer_mixervoice_obj_t *self, audiomixer_mixer_obj_t *parent) {
     self->parent = parent;
 }
 
-mp_float_t common_hal_audiomixer_mixervoice_get_level(audiomixer_mixervoice_obj_t *self) {
-    return (mp_float_t)self->level / (1 << 15);
+mp_obj_t common_hal_audiomixer_mixervoice_get_level(audiomixer_mixervoice_obj_t *self) {
+    #if CIRCUITPY_SYNTHIO
+    return self->level.obj;
+    #else
+    return mp_obj_new_float((mp_float_t)self->level / (1 << 15));
+    #endif
 }
 
-void common_hal_audiomixer_mixervoice_set_level(audiomixer_mixervoice_obj_t *self, mp_float_t level) {
-    self->level = (uint16_t)(level * (1 << 15));
+void common_hal_audiomixer_mixervoice_set_level(audiomixer_mixervoice_obj_t *self, mp_obj_t arg) {
+    #if CIRCUITPY_SYNTHIO
+    synthio_block_assign_slot(arg, &self->level, MP_QSTR_level);
+    #else
+    self->level = (uint16_t)(mp_arg_validate_obj_float_range(arg, 0, 1, MP_QSTR_level) * (1 << 15));
+    #endif
 }
 
 bool common_hal_audiomixer_mixervoice_get_loop(audiomixer_mixervoice_obj_t *self) {
diff --git a/shared-module/audiomixer/MixerVoice.h b/shared-module/audiomixer/MixerVoice.h
index ad70f64b6e16..dd9095515459 100644
--- a/shared-module/audiomixer/MixerVoice.h
+++ b/shared-module/audiomixer/MixerVoice.h
@@ -9,6 +9,9 @@
 
 #include "shared-module/audiomixer/__init__.h"
 #include "shared-module/audiomixer/Mixer.h"
+#if CIRCUITPY_SYNTHIO
+#include "shared-module/synthio/block.h"
+#endif
 
 typedef struct {
     mp_obj_base_t base;
@@ -18,5 +21,9 @@ typedef struct {
     bool more_data;
     uint32_t *remaining_buffer;
     uint32_t buffer_length;
+    #if CIRCUITPY_SYNTHIO
+    synthio_block_slot_t level;
+    #else
     uint16_t level;
+    #endif
 } audiomixer_mixervoice_obj_t;