The Transpos-O-Matic Music Sliderule is a handy aid to musicians, students, and teachers. Easy and portable, the user can transpose melodies and chords in an instant. The devise also includes helpful musical tables.

An interractive chord and scale resource for guitarists and bassists. The ultimate chord book uses an algorithmic approach to finding chords and scales so that any chord or scale can be found on any instrument in any tuning.