According to
THIS POST we can tweak the audiopara3.csv file in the column: rxVolume to reduce the volume of the earpiece.
The author said he found effectiveness "halving" the hex values on the 12
PHONE_EARCUPLE_VOL fields.
I don't know how to interpret HEX values which is what it has been encoded in to change it.
Can some1 help as the SPCS TP2 earpiece is painfully loud & the volume rocker doesn't provide any useful help.