While recording sound and voice into almost any substance is possible,(the technology to do so is used in the common ipod) there is no evidence to my knowledge of Tesla working in this field...... you should contact Brad Scott at wildbranchministries.com for more information pertaining to the scientist working in this field.
Best of luck in your endeavor,
God bless
Maroon

Logged
"we have met the enemy"....and he is us....self is all that keeps us from the endless possibilities of science.
*adapted quote*