diff --git a/ports/unix/variants/coverage/mpconfigvariant.mk b/ports/unix/variants/coverage/mpconfigvariant.mk
index 8b25ddb705..854d052c6c 100644
--- a/ports/unix/variants/coverage/mpconfigvariant.mk
+++ b/ports/unix/variants/coverage/mpconfigvariant.mk
@@ -33,6 +33,9 @@ SRC_BITMAP := \
 	shared-bindings/audiocore/__init__.c \
 	shared-bindings/audiocore/RawSample.c \
 	shared-bindings/audiocore/WaveFile.c \
+	shared-bindings/audiomixer/__init__.c \
+	shared-bindings/audiomixer/Mixer.c \
+	shared-bindings/audiomixer/MixerVoice.c \
 	shared-bindings/bitmaptools/__init__.c \
 	shared-bindings/displayio/Bitmap.c \
 	shared-bindings/rainbowio/__init__.c \
@@ -48,6 +51,9 @@ SRC_BITMAP := \
 	shared-module/audiocore/__init__.c \
 	shared-module/audiocore/RawSample.c \
 	shared-module/audiocore/WaveFile.c \
+	shared-module/audiomixer/__init__.c \
+	shared-module/audiomixer/Mixer.c \
+	shared-module/audiomixer/MixerVoice.c \
 	shared-module/bitmaptools/__init__.c \
 	shared-module/displayio/area.c \
 	shared-module/displayio/Bitmap.c \
@@ -67,6 +73,7 @@ SRC_C += $(SRC_BITMAP)
 CFLAGS += \
 	-DCIRCUITPY_AESIO=1 \
 	-DCIRCUITPY_AUDIOCORE=1 \
+	-DCIRCUITPY_AUDIOMIXER=1 \
 	-DCIRCUITPY_AUDIOCORE_DEBUG=1 \
 	-DCIRCUITPY_BITMAPTOOLS=1 \
 	-DCIRCUITPY_DISPLAYIO_UNIX=1 \
diff --git a/shared-bindings/audiomixer/Mixer.c b/shared-bindings/audiomixer/Mixer.c
index 58c618fc11..83fcc06712 100644
--- a/shared-bindings/audiomixer/Mixer.c
+++ b/shared-bindings/audiomixer/Mixer.c
@@ -33,8 +33,6 @@
 #include "py/binary.h"
 #include "py/objproperty.h"
 #include "py/runtime.h"
-#include "shared-bindings/microcontroller/Pin.h"
-#include "shared-bindings/audiocore/RawSample.h"
 #include "shared-bindings/util.h"
 #include "supervisor/shared/translate/translate.h"
 
diff --git a/shared-bindings/audiomixer/Mixer.h b/shared-bindings/audiomixer/Mixer.h
index fd1154cc43..d04f793dde 100644
--- a/shared-bindings/audiomixer/Mixer.h
+++ b/shared-bindings/audiomixer/Mixer.h
@@ -28,7 +28,6 @@
 #define MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOMIXER_MIXER_H
 
 #include "shared-module/audiomixer/Mixer.h"
-#include "shared-bindings/audiocore/RawSample.h"
 
 extern const mp_obj_type_t audiomixer_mixer_type;
 extern const mp_obj_type_t audiomixer_mixervoice_type;
diff --git a/shared-bindings/audiomixer/MixerVoice.c b/shared-bindings/audiomixer/MixerVoice.c
index 16a1be520f..1d6cd7f39a 100644
--- a/shared-bindings/audiomixer/MixerVoice.c
+++ b/shared-bindings/audiomixer/MixerVoice.c
@@ -32,8 +32,6 @@
 #include "py/binary.h"
 #include "py/objproperty.h"
 #include "py/runtime.h"
-#include "shared-bindings/microcontroller/Pin.h"
-#include "shared-bindings/audiocore/RawSample.h"
 #include "shared-bindings/util.h"
 #include "supervisor/shared/translate/translate.h"
 
@@ -115,7 +113,7 @@ STATIC mp_obj_t audiomixer_mixervoice_obj_set_level(size_t n_args, const mp_obj_
     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
     mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
-    float level = mp_obj_get_float(args[ARG_level].u_obj);
+    mp_float_t level = mp_obj_get_float(args[ARG_level].u_obj);
 
     if (level > 1 || level < 0) {
         mp_raise_ValueError(translate("level must be between 0 and 1"));
diff --git a/shared-bindings/audiomixer/MixerVoice.h b/shared-bindings/audiomixer/MixerVoice.h
index bce4632760..0ff8accee4 100644
--- a/shared-bindings/audiomixer/MixerVoice.h
+++ b/shared-bindings/audiomixer/MixerVoice.h
@@ -26,9 +26,6 @@
 #ifndef SHARED_BINDINGS_AUDIOMIXER_MIXERVOICE_H_
 #define SHARED_BINDINGS_AUDIOMIXER_MIXERVOICE_H_
 
-#include "common-hal/microcontroller/Pin.h"
-#include "shared-bindings/audiocore/RawSample.h"
-
 #include "shared-module/audiomixer/MixerVoice.h"
 #include "shared-module/audiomixer/Mixer.h"
 
@@ -39,8 +36,8 @@ 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);
-float common_hal_audiomixer_mixervoice_get_level(audiomixer_mixervoice_obj_t *self);
-void common_hal_audiomixer_mixervoice_set_level(audiomixer_mixervoice_obj_t *self, float gain);
+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);
 
 bool common_hal_audiomixer_mixervoice_get_playing(audiomixer_mixervoice_obj_t *self);
 
diff --git a/shared-bindings/audiomixer/__init__.c b/shared-bindings/audiomixer/__init__.c
index 8292be9e95..4c8068172b 100644
--- a/shared-bindings/audiomixer/__init__.c
+++ b/shared-bindings/audiomixer/__init__.c
@@ -29,7 +29,6 @@
 #include "py/obj.h"
 #include "py/runtime.h"
 
-#include "shared-bindings/microcontroller/Pin.h"
 #include "shared-bindings/audiomixer/Mixer.h"
 
 //| """Support for audio mixing"""
diff --git a/shared-module/audiomixer/Mixer.c b/shared-module/audiomixer/Mixer.c
index 1c5de4d934..ce39f88919 100644
--- a/shared-module/audiomixer/Mixer.c
+++ b/shared-module/audiomixer/Mixer.c
@@ -35,6 +35,10 @@
 #include "shared-module/audiocore/__init__.h"
 #include "shared-module/audiocore/RawSample.h"
 
+#if (defined(__ARM_ARCH_7EM__) && (__ARM_ARCH_7EM__ == 1))
+#include "periph.h"
+#endif
+
 void common_hal_audiomixer_mixer_construct(audiomixer_mixer_obj_t *self,
     uint8_t voice_count,
     uint32_t buffer_size,
@@ -140,7 +144,7 @@ static inline uint32_t mult16signed(uint32_t val, int32_t mul) {
     float mod_mul = (float)mul / (float)((1 << 15) - 1);
     for (int8_t i = 0; i < 2; i++) {
         int16_t ai = (val >> (sizeof(uint16_t) * 8 * i));
-        int32_t intermediate = ai * mod_mul;
+        int32_t intermediate = (int32_t)(ai * mod_mul);
         if (intermediate > SHRT_MAX) {
             intermediate = SHRT_MAX;
         } else if (intermediate < SHRT_MIN) {
diff --git a/shared-module/audiomixer/MixerVoice.c b/shared-module/audiomixer/MixerVoice.c
index bb58b0c111..f4d2a6514e 100644
--- a/shared-module/audiomixer/MixerVoice.c
+++ b/shared-module/audiomixer/MixerVoice.c
@@ -42,12 +42,12 @@ void common_hal_audiomixer_mixervoice_set_parent(audiomixer_mixervoice_obj_t *se
     self->parent = parent;
 }
 
-float common_hal_audiomixer_mixervoice_get_level(audiomixer_mixervoice_obj_t *self) {
-    return (float)self->level / (1 << 15);
+mp_float_t common_hal_audiomixer_mixervoice_get_level(audiomixer_mixervoice_obj_t *self) {
+    return (mp_float_t)self->level / (1 << 15);
 }
 
-void common_hal_audiomixer_mixervoice_set_level(audiomixer_mixervoice_obj_t *self, float level) {
-    self->level = level * (1 << 15);
+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_play(audiomixer_mixervoice_obj_t *self, mp_obj_t sample, bool loop) {