As a percussionist working with a lot of different instruments I have often found myself investigating possibilities to alter sounds. In the mallet percussion specially there are not many things one can do besides changing mallets and preparing a little bit on the instrument. But if you want to alter tunings, some collaboration is needed. With TEMKO we got into listening a lot of Terry Riley’s music, where we found orselves intrigued by his Shri Camel recording, which was never performed live. Terry did not play that piece since he took a lot of time altering tunings on the old synthesizers. When Aart, Fred and me got into discussion about tuning systems we took some time reading up on various articles and found a tuning which possibly would be the one Terry used: the Just intonation. Basically that is a baroque way of tuning perfect fifths. If you do that some notes sound really out of tune, and others as perfect as it can get. By writing down some structures and notes form the Shri Camel record by ear we discovered that the piece was written in a rather low C major tuning. Then I was interested in modifying the vibraphone, since this piece would benefit a lot from resonant notes and the use of a pedal. When I spoke with Frans Swinkels and Albert Straten from Adams Musical Instruments they were very supportive and enthusiast. And they encouraged me to figure out the tuning in herz or cents. But Frans explained me in the mean time that tuning keyboards down is way harder then tuning them up. When I got together with Aart, speaking about guitar frets and strings, we figured the ensemble would benefit a lot if we would play it in a rather high B tonality instead of C. Then I send through the tuning system and two weeks later I received a phone call and tested the instrument at the Adams factory in Ittervoort. A brand new altered Adams Alpha design was ready in Just Intonation! Listen to our first rehearsal with this instrument.