ok so heres the deal i went to the electronics shop and brought a sine / square oscillator kit goes from like 2hz to 20khz i think it outputs from like 0v to 2v (amplitude of wave) cant remeber much else bout it atm. iv nearly finished putting it together the next thing is getting a envelope generator but i dont think they have a kit like that at the shop so i need some places to look for some plans / schematics the problem im having is finding one that suits my needs as i dont know whats what. side note - i need to be able to mesure the freq of the wave to tune it up so it runs properly - can i plug the output of the vco into my computer and use a program to read it? - ie. anyone got a suggestion for a program i could use - eg a ocsilloscope program p.s. i just saw add up top so ill check that out