I have been using the Mapes schraffed strings for 15 years. Many of
these sets are in recording studios, many others are in a university's music
school. I have to say that the difference in tone is subtle, but the
difference is durability is significant. I see far less problems such as
oddball overtones and dead strings on pianos that I strung with schraffed
strings.
In my experience,the twisting is required whether or not the string is
schraffed. I had poor results on the only job I installed schraffed strings
with no twist. Thankfully, there was a quite tight block, and after letting
them down, and twisting them 1 1/2 turn, they responded as though they were a
different set. The twist is important.
regards,
Ed Foote
Precision Piano Works
Nashville, Tn.
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