After you soldered your headers and mics, it's time to try and get some sound in and output from your teensy devices! Here is a short how-to, partially summarizing what we did in the last online session.
Installing Arduino IDE and Teensyduino: https://www.pjrc.com/teensy/td_download.html Opening and programming the example patch
If you are having problems connecting your teensies :( read through the following sections: