tuning external component toa particular voltage level with labview

[Chaitanya]

i need to check the voltage levels of two components(for ex: speaker o/p) in the unit under test using labview .And, if the levels are not to the desired level, I need to tune a couple of other components(for ex:volume controls) on the board so that the level of the speakers comes to desired level.This tuning is not to be done manually. It should be programmed!

[chutla]

Are you using a data acquisition card? If so, the job is very simple, You can sample the output level with an analog scan vi, and use it in a feedback loop. This can control an audio frequency analog output (if you have a multifunction DAQ card)