Does the STL cause some nonlinearity or other things? If the signal gets modified in any way, you get peaks and if you compensate the modulation level you loose loudness. So in that case it would be better to have Stereo Tool at the transmitter.
Otherwise it doesn't matter. If the STL adds noise, then running *all* of Stereo Tool after it will boost the noise, so then the opposite might be true.
An alternative is to split Stereo Tool in 2 parts, and do everything except the final clipping at the studio, and the stereo/rds/clipping part at the transmitter.
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