I dropped in a bass sample maxed at -0.4 dB into Sampler Track.
Playing it back from Sampler Track on the same note I get around -5 dB, so it is considerably quieter.
Velocity sensitivity is off, no filter, no change in Amp envelope, no sampler engine processing at all. All notes are playing back with 127 velocity.
Is there any internal headroom when playing from Sampler Track?