Presumably you would want to make the slider scale a floating‑point scale. Whether linear or logarithmic, I shall leave you to work out. You can read about it in the
Java™ Tutorials. It appears the ticks are spaced in
ints, so you can't use floating‑point numbers, only percentages or similar.
I can't see any problems with two Components having the same Listener, but you would have to synchronise the sliders so changes in one are reflected in the other and you aren't trying two different speeds simultaneously.