Sostenuto regulation

[Paul]

Keith
Maybe this has been stated but I'll just mention that the key lift, damper
pedal lift, and the engaged sustenuto should hold the damper at the same
height ( as close to this as possible).  Once this setting is achieved, the
stop rail should be resting by its own weight.on the raised damper levers.
Then tighten its screws. The damper stop rail should prevent significant
upward movement to cause the damper to "hang up" on the engaged sustenuto or
cause the damper to bounce on the end of the key creating a "tap" on the key
or increase touch weight, which can be felt by the pianist.

Paul Chick
----- Original Message -----
From: <kam544@flash.net>
To: <pianotech@ptg.org>
Sent: Wednesday, February 07, 2001 8:53 AM
Subject: Re: Sostenuto regulation


> >...   If the underlevers are allowed unlimited upward travel, a strong
> >blow can
> >send them over the top of the engaged sostenuto rod.  This doesn't
happpen
> >with the unsprung sos. tabs, but the later models will allow the
underlever
> >tab to go above, and when it does, it stays up there!
> >Regards,
> >Ed Foote RPTs
>
> Ed, Conrad, List,
>
> Thank you for this additional information.
>
> For my benefit, let me be certain I understand your comments.
>
> With the damper and sostenuto system properly regulated, with the
sostenuto
> pedal purposely engaged, and for some reason the damper stop rail is not
> regulated properly, but is set at its highest point, then any piano
playing
> during this time that has strong blows can cause other notes to hang up on
> the engaged blade, that is, on the models that don't have the tabs with
the
> springs.
>
> This is what you are saying, yes?
>
> Keith McGavern
> Registered Piano Technician
> Oklahoma Chapter 731
> Piano Technicians Guild
> USA
>
>