Add SPDX.

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Kattni Rembor 2023-07-05 17:05:12 -04:00
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// SPDX-FileCopyrightText: 2023 Kattni Rembor for Adafruit Industries
// SPDX-FileCopyrightText: Earle F. Philhower, III
//
// SPDX-License-Identifier: MIT
/*
This example plays a tune through a mono amplifier using a simple sine wave.