Here is a video of the Trollmaster in action. Don't forget to turn Youtube annotations on. Enjoy :-)
The seven-segments display shows the FM frequency. Two push-buttons allow to change the frequency up or down by steps of 0.5 Mhz.
The Trinket Pro runs the PCM library of 'low-high tech' and loops a sample of the Trololo song. It also drives the MMR-70 FM transmitter which generates a FM+RDS signal with a station name of "TROLL FM".