New version 1.7 now includes sound level sensitivity adjustment, and one octave pure tone "piano" keyboard, and support for Pocket PC as well as Pocket PC 2002 devices.

Tunerrr uses the sound picked up by the Pocket PC's built in microphone to help you tune a musical instrument. By frequency analysing the incoming sound, Tunerrr finds the closest note on the equal tempered scale.

Tunerrr is capable of detecting musical notes in the frequency range from 10Hz to 4000Hz, with a resolution of less than 1Hz. When Tunerrr detects a note, it displays the note's letter, highlights the corresponding key on a depiction of a 1 octave piano keyboard, and gives an indication of how close the detected frequency is to the standard tuning for the note.

A set of colored bars in the Tunerrr display indicate the sound level in each of 9 channels centered on the target frequency for the detected note. This provides a convenient visual indication of how close the instrument's note is to the desired tuning.

The Tunerrr display also includes a 'scope that shows the audio signal picked up by the Pocket PC's internal microphone.
A sound level meter allows you to adjust the sensitivity of Tunerrr.