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There's two ways of lowering BPM.
First, you mentioned it already, there's timestreching. The program will attempt to fill up the gaps of sthe stretching process with sampled parts from around the gap. This can affect timing and soundquality but works great for stationary and periodic signals.
Second there's pitchshifting without time correcting. Here the programm will insert an interpolated sample here and there. timing will stay exact within a few samples and sound quality only depends on the degree of interpolation (which is quite exact most of the time). Only thing here is that the overall pitch will drop by the percentage you stretch time.
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