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libraries/audio-tools/examples/examples-stream/streams-memory_mp3-pwm/README.md

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+# Decoding a MP3 file
+
+In this example we decode a MP3 file into RAW output and write the output with the help of a PWM signal to the pins. 
+
+Currently we provide multiple mp3 decoders
+- libhelix 
+- tinymp3
+
+Unfortunatly non of those are currently stable in all environments....
+
+
+### Output Device: Earphone
+
+To test the output I am using an earphone from a mobile phone. 
+We get 2 signals one for the left and the other for the right channel.
+
+![DAC](https://pschatzmann.github.io/Resources/img/earphones.jpg)
+
+
+The pins depend on the Processor:
+
+
+| EarPhone   |  ESP32       | RPI Pico      | MBED         |
+| -----------| -------------|---------------|--------------|
+| Left       |  GPI2        | GPI2          | GPI2         |
+| Right      |  GPI3        | GPIO3         | GPI3         |
+| GND        |  GND         | GND           | GND          |
+
+To verify check the PIN_PWM_START in AudioConfig.h or you can set the pins by calling setPins() method on the PWMConfig object.