I'm going off the manual for my new PA units but if yours is also a Paragon 2 unit then it should be the same info.
It looks like you can set CV 133 to zero to turn the sound off, and CV248 to zero to eliminate the motor start delay. . This will probably not significantly decrease the start voltage though.
You'll either need to find a friend with a DCC system to set the CVs or buy their DC Master Analog Control Module product.