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Audio can be obtained from the Othermod in a few different ways. The simplest is to utilize a Othermod show, yet that is not generally a choice. Using a USB audio adapter is the next option. That is fine, but unless you have room in your project for a micropubs hub, it takes up the only USB port that is available. It is also I2S over GPIO, but that requires some software tweaks and makes it a little more difficult a guide for it is coming later this year. Another option is PWM audio, and this guide explains how to get it working. The procedure A pair of GPIO pins allow the Raspberry Pi to produce audio. The audio is badly distorted, which is the issue. The speaker rumbles and sounds blown when the low notes are played too low, and there is a lot of unwanted noise when the high notes are played.