thankyou crossroads!
i,will check the digital potentiometeers deapply, but in the overview, i've found that its control "only by up and down signals (im searhing for a component that convert direcctly the pwm that i get from arduino, to control the "digital potentiometer" but just cant findit... =( , and i don't complexing a lot the code. plus the are hardly find here in chile, i have not much time for this time.
i think that i will use an 8 chanels demultiplexer, that only shicthes, but this way i can save time to bring all sistem togeder and get the best interacctions with the users...
thankyou!!!