On a tiny 32-kilobyte memory chip, the Tabstrummer can save up to 300 "songs," or combinations of preprogrammed chords. Rather than picking strings, the player rubs a finger against conductive copper traces etched into the instrument's body and touches aluminum tape on the back of the neck, completing an electrical circuit. A microcontroller sends commands to a sound generator based on which traces the guitarist touches and which chord is active. In response, the sound generator activates either a set of tones stored in an onboard sound-module board (through headphones) or a much richer range of sounds from audio software on a connected computer. Sowa and Zagainov plan to sell a refined version of the Tabstrummer, complete with buttons to aid guitar solos, as well as controls that affect pitch and mimic the bluesy effect of bending strings.