Skip to content


Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?


Failed to load latest commit information.
Latest commit message
Commit time
March 31, 2023 19:05
April 22, 2021 16:24
March 31, 2023 19:05

M8 Headless Firmware for Teensy 4.1

M8 Headless Precompiled Firmware. Used for Teensy 4.1 connected to a host computer via USB.

Read the setup guide here:

See also:

For optimal performance of the SD card, it should be formatted FAT32 using the SD Memory Card Formatter tool: The random read speed of the card must also be very good. Testing has shown two cards that perform well and are currently suggested:

  • Lexar Professional 1800X (Expensive but nice)
  • SanDisk 32GB Ultra microSDHC (Cheaper but reliable)

About samples on the microSD card

Samples should be located in the /Samples directory on the card in mono or stereo wav format. Try to use mono where you can to reduce load on the microSD card if you're playing back multiple channels of samples. Subdirectories are supported but the maximum file path length (including the name and extension) is 127 characters.

Preliminary user-contributed manual

A user-contributed M8 manual is available here:

More help is available on our Discord server

Join us on Discord!