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Music creation at the touch of a button with Tabstrummer

The guitar-shaped Tabstrummer programmable MIDI controller allows users to create and register guitar chords to buttons on the neck and strum songs via PCB strings

Electronics enthusiast Miroslaw Sowa and programmer Vsevolod Zagainov - both from Montreal, Canada - are currently busy putting the final touches on a new button-based, guitar-shaped sound machine called the Tabstrummer. In the same way that tablature notation has allowed players like me (who are unable to read score) to learn new songs, this new MIDI instrument allows folks who'd like to play a guitar, but for whatever reason can't, the opportunity to easily create some chord-strumming music. The instrument allows chord shapes to be assigned to clicky buttons on the short neck, which can then be recalled and played as a song by simultaneously strumming or picking the virtual strings.
A later version looking closer to the current pre-production prototype - black acrylic with working electronics on protoboards


The various components of prototype number two


Described by its creator as a karaoke for your fingers, the Tabstrummer features an Atmel microcontroller at its heart, touch-sensitive printed-circuit-board (PCB) trace strings positioned in the familiar position on the transparent 3mm-thick acrylic guitar body (which are wide enough apart to enable individual picking as well as full strumming), and a neck hosting 24 clicky buttons. A dozen of these buttons can be programmed with a chord shape and stored in the onboard memory, which retains entries even after the instrument is powered off. The instrument also features MIDI out and audio out ports.






To enter a chord shape for later recall, a user presses the RC button on the neck to activate the Record Chord edit mode. The user is then prompted to press one of 14 sound-generating buttons - 12 numbered buttons representing fret positions on a guitar neck, the X button for a muted string or the O for open string - for each of the six strings. A user could, for example, mute the bottom E string, then press button number 2 for the A string, then 2 again for the D string, followed by 1 for the G string, then 0 or mute for the remaining two strings.

When all of the string values have been chosen, a green LED flashes to signal that the chord needs to be stored in a memory location for later recall.

After 12 chord patterns have been stored, a user can then choose to record a song using the RS button. Up to 300 songs can be stored in the instrument's onboard memory, and can be subsequently retrieved using the LS button. The SND button offers eight different guitar-like sounds, and the TNS button allows the player to raise or lower recorded song settings by a semi-tone - then the new transposition can be saved to another memory location.

As with guitar tab (where a player needs to follow finger/fret positions marked on a diagrammatic representation of a guitar's six strings in order to play), the timing, rhythm and some knowledge of how a chosen song actually sounds will need to come from the user.

The designers are hoping to release the unit as a build-your-own kit containing the printed circuit board with surface-mounted components already soldered in place, and the acrylic body and housing - or as a fully-assembled model - in Q2 2012. Sowa told us that the Tabstrummer will likely cost in the region of US$100 to $200.

As you can see (and hear) from the following demonstration video, the clicking sound of the buttons may prove to be rather annoying. Perhaps, if I may be so bold as to suggest, later versions might replace the clicky buttons with something more like those on the Kitara's fingerboard.


Source: Newatlas

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