This is a known bug that got squashed in the later OS’s.
However – some kits are still affected.

Luckily, there is a simple solution to this problem.

Choose the FX track of the affected Kit, press Function + Sound, then Sound Settings and in that menu choose Velocity Mod. Make sure that all the velocity modulation sources are set to NONE with 0 Depth. You should now be able to set the input level correctly.

Happy filtering! :joy: