Rolling to Pitch

[Joel A. Jones]

List,

I am mystified at what happened yesterday to a piano that
is tuned several times a year.  Last tuned in May at A-440
I found the overall pitch to be 20 + cents sharp.  Since this
piano is not my favorite so an extreme solution came to my
devilish mind.

Using the string roller I proceeded to go over every steel
string using generous force.   This accomplished two things.
1. It made me feel better physically as I rolled back and forth
on the strings.  2.  It brought the pitch down close enough so
that a one pass tuning was possible.

Question:
Why did this work?

Where was all the 'slack'
in the strings that put the pitch close to A-440?

Anyone have this experience particularly at this
time of year when the pitch is traditionally sharp?

Will this work if I roll the tenor strings above the bass break
where they  are usually sharper than the rest of the
piano after Summer humidity?

Totally mystified in Madison.

Joel

Joel Jones, RPT
Madison, WI