noise/pitch would increase with engine revs, not road speed. i.e. the noise at 3000rpm in any given gear would sound the same.
without hearing it i couldnt say for sure, but if your not losing fluid, it may be the tensioner for the steering pump belt rather than the pump itself.
this is just me making an educated guess however as i aint had problems with my steering pump on my car and so no experiencein this problem
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