ROBERTO AUSSEL: It is unbelievable, but it was not until this moment that I played a guitar that is so precise, so accurate.
HORACIO CEBALLOS: Francisco, you have won, and I feel happy because of this development. The musical intervals have at last agreed in your guitars because of your method.
IRMA CONSTANZO: Estrada Gómez surprises us with a new discovery. He has put into practice a new “geometric progression” that has improved guitar tuning. All I can do is congratulate him.
MÁXIMO PUJOL: I am pleased about being a contemporary of the new “geometric progression” applied by Estrada Gómez, who solved the problem of tuning.
DELIA ESTRADA: The formula to build the frets of the guitar suggested by Estrada Gómez is a successful contribution for the tuning of the instrument.
EDUARDO FALÚ: Thank you very much, Master, for offering the guitar world the complete solution to the problem which seemed impossible to solve.
JUAN FALÚ: The new geometric progression for fretting guitars proposed by Estrada Gómez places people who are fond of guitars as witnesses of an unusual fact and, above all, artistic and exciting.
EDUARDO ISAAC: I could prove that Estrada Gómez guitars react with accuracy even when the demand is too high - which had not been accomplished until now - providing the musician with the possibility of achieving a greater artistic performance.
DUET OF BOCACCIO-GALLINO: The warmth, harmonic width and sound of the Estrada Gómez guitars made our interpretations reach a new spatial dimension.
His new method for fretting instruments give us plenty of confidence to work in chamber music.
GRACIELA POMPONIO: Estrada Gómez offers us a guitar that, besides its usual quality, adds tuning. The results can be heard and enjoyed.
MARÍA ISABEL SIEWERS: Every single attempt to improve the tempered tuning is of a great value. Estrada Gómez has advanced a lot in this topic with his method. We have to thank Estrada Gómez as regards his great contribution to the guitar world.
CACHO TIRAO: Estrada Gómez, and that mysterious new method that he invented, gets a perfect tuning and a vast sound expansion.