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diff --git a/circuitpython/shared-bindings/audiomixer/Mixer.h b/circuitpython/shared-bindings/audiomixer/Mixer.h
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+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOMIXER_MIXER_H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOMIXER_MIXER_H
+
+#include "common-hal/microcontroller/Pin.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;
+
+void common_hal_audiomixer_mixer_construct(audiomixer_mixer_obj_t *self,
+    uint8_t voice_count,
+    uint32_t buffer_size,
+    uint8_t bits_per_sample,
+    bool samples_signed,
+    uint8_t channel_count,
+    uint32_t sample_rate);
+
+void common_hal_audiomixer_mixer_deinit(audiomixer_mixer_obj_t *self);
+bool common_hal_audiomixer_mixer_deinited(audiomixer_mixer_obj_t *self);
+
+bool common_hal_audiomixer_mixer_get_playing(audiomixer_mixer_obj_t *self);
+uint32_t common_hal_audiomixer_mixer_get_sample_rate(audiomixer_mixer_obj_t *self);
+uint8_t common_hal_audiomixer_mixer_get_channel_count(audiomixer_mixer_obj_t *self);
+uint8_t common_hal_audiomixer_mixer_get_bits_per_sample(audiomixer_mixer_obj_t *self);
+
+#endif // MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOMIXER_MIXER_H