Disklavier

I have read previously on this group that the only upgrade for an MX100A is the
DSR1 module.  However, I just moved, and in searching for a new tuner with DKV
experience, I found one whose web site mentions the following:

"For those of you who are involved with the MX100, this was the first DKV that
Yamaha produced. It was later improved so that it would play softer and with
more dynamics. This upgrade is easily identified by looking for the "choke
handle" located under the bass end of the keybed. It's not that difficult for a
qualified technician to install and takes about an hour or so to put in."

Is this something that would be of value?  I do have a problem with getting the
piano to play soft background music for dinner parties, and I really don't want
to add acoustic baffling material.  This sounds like a perfect solution.

Thanks,
Grem