Here is a fourth beta test for Teensyduino 1.54.
Edit: Links removed. Please use 1.54-beta9
https://forum.pjrc.com/threads/67252-Teensyduino-1-54-Beta-9
Changes since Teensyduino 1.54-beta3:
Update NativeEthernet
Audio: Improve simultaneous WAV playing & add SimultaneousPlay test
SD default to 16 MHz SPI clock
Serial Monitor fix double spaced lines copied to clipboard
Serial Monitor avoid auto horizontal scroll on very long lines
Serial Monitor fix memory leak on MacOS
Edit: Links removed. Please use 1.54-beta9
https://forum.pjrc.com/threads/67252-Teensyduino-1-54-Beta-9
Changes since Teensyduino 1.54-beta3:
Update NativeEthernet
Audio: Improve simultaneous WAV playing & add SimultaneousPlay test
SD default to 16 MHz SPI clock
Serial Monitor fix double spaced lines copied to clipboard
Serial Monitor avoid auto horizontal scroll on very long lines
Serial Monitor fix memory leak on MacOS