Changes/Additions to original code

• Added FM version of AudioSynthWaveform: AudioSynthWaveformModulated
• Added isPlaying() to AudioEffectEnvelope to check if an envelope is currently playing.

Teensy Audio Library

16 bit, 44.1 kHz streaming audio library for Teensy 3.x, featuring:

• Polyphonic Playback
• Recording
• Synthesis
• Analysis
• Effects
• Filtering
• Mixing
• Multiple Simultaneous Inputs & Outputs
• Flexible signal routing between library objects
• Automatic Streaming while your Arduino sketch runs

Main Audio Library Page

http://www.pjrc.com/teensy/td_libs_Audio.html

Audio System Design Tool

Use this graphical tool to design your audio project. Easily browse the library's many features, connect objects, export to Arduino code, and quickly access details for the functions each object provides for you to control it from your Arduino sketch!

http://www.pjrc.com/teensy/gui/index.html

Supported Hardware

Audio Adaptor Board for 16 bit stereo input and output.

Dual Audio Adaptor Boards for quad channel 16 bit input and output.

Teensy 3.6, Teensy 3.5, Teensy 3.2, or Teensy 3.1 12 bit DAC Output (Mono)

Teensy 3.6, Teensy 3.5, Teensy 3.2, Teensy 3.1 or Teensy 3.0 ADC Input (Mono)

Teensy 3.6, Teensy 3.5, or Teensy 3.2 ADC Input (Stereo)

Teensy 3.6 or Teensy 3.5 12 bit DAC Output (Stereo)

Teensy 3.6, Teensy 3.5, Teensy 3.2, Teensy 3.1 or Teensy 3.0 PWM Output (Mono)

USB Audio: Bi-Directional Stereo Streaming to a PC