Arduino Teensy Guitar Audio Shield from Blackaddr Audio on Tindie
PJRC Teensy 4.0 USB Development Board : ID 4323 : $24.95 : Adafruit Industries, Unique & fun DIY electronics and kits
PJRC Store
Teensy 4.x Audio Adapter - ProtoSupplies
PJRC Store
Music 250a | Winter 2020 - Lab 2: Embedded Audio DSP with Faust and the Teensy
Open Audio: Teensy Audio over USB
PJRC Store
Open Audio: Teensy Audio over USB
Paul Stoffregen on Twitter: "Teensyduino 1.52 release today, with much more than just Teensy 4.1 support. OctoWS2811 on any pins, T4 USB Audio, Dual & Triple USB Serial, 6 & 8 channel