Paul & Robin at PJRC are at it again with adapting the excellent Audio Sheild board from the Teensy 3 up to for the Teensy 4.0. This audio board is a suitable partner for this latest iteration of the impressive Teensy series of microcontrollers.

This audio adapter allows the manipulation of 16bit, 44.1kHz (CD quality) audio with your Teensy, featuring:

• SGTL5000 stero codec IC
• Simultaneous playback of WAV / RAW files
• Capable of audio synthesis, analysis and recording (yup, the Teensy 4 is that powerful!)
• microSD slot for Class 10 storage (up to 32GB)
• 3.5mm Audio Jack
• Pinouts for
  • Audio Data (I2S / analog)
  • Audio Control (I2C)
  • Volume control
  • Solder-on-board high-performance low-latency flash memory
• Realtime FFT capability

The Teensy Audio library that it uses lets you:

• 4 channel mixer
• Graphically connect your audio mix (which turns into Arduino code!)