Driving servos from a PC

As part of a construction project for a charitable event, I need to build a number of big analogue dials (like an old-fashioned voltmeter) controlled by a series of PCs (each computer drives two dials). Accuracy isn't critical, but I do have a fairly strict budget restriction.

One possibility seems to be to use an RC servo to move a big cardboard needle. I've not used servos before, but a little research suggests that the required position is commanded by altering the pulse width of a ~5v 50Hz square-wave signal a little either side of 2ms.

As I said, I don't have much of a budget. I also have limited electronics knowledge. But is it totally unrealistic to consider controlling these servos via a soundcard output? I envisage putting one dial on each of the left and right channels, and getting the card to spit out an appropriate wave-form to each of them. I realise this won't be a proper square-wave, but am I likely to get close enough?

What else have I missed? Do you have another (cheap) suggestion, whether involving servos or not?

Thanks,

Pete
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