Spirio Action Components
Key Upstop Rails
Spirio makes use of key upstop rails that are not a part of the traditional Steinway design. The key upstop rails determine the key travel when the keys are activated from underneath by the note solenoids; in the same way that the front rail punchings determine the key travel when played manually.
a. key upstop rails (underside view of action stack)
a. key upstop rail and felt (bass end side view of action)
Pre-Regulation Upstop Rail Setting
Before regulating the action, it's recommended to move the key upstop rails out of the way. This will ensure that the rails are not interfering with the key travel. You should only raise the rails slightly higher than their final post-regulation position. If the rails are too high, they will contact the repetitions, which will upset a variety of regulation parameters, such as key level and hammer line.
To set the rails out of the way:
- Use a long flat-head screwdriver to slightly loosen the two screws - do not remove screws.
- Use a firm touch on a sharp key while the rail loose. This will sufficiently push it out of the way.
- Raise the rail to desired position and tighten screws.
Final Upstop Rail Position
After action regulation is complete, position the key upstop rail so that it contacts the keys at the same time full key travel is reached.
Key At Rest
a. key upstop rail
b. key stick
c. front rail punching
Full Key Travel
a. key upstop rail
b. key stick
c. front rail punching
To set the final rail position:
- Slightly loosen both screws. At one end of the rail, set the key upstop rail with a medium touch on a natural key at full dip. Tighten the corresponding screw and repeat at the other end of the rail.
- Repeat this process for the upstop rails in each section.
a. key upstop rail adjustment screw
use a flashlight to find the key upstop rail adjustment screw.
Balance Rail Studs
The position of the balance rail studs effects key dip and therefor effects the function of the key upstop rail. If the balance rail studs are adjusted, be sure to check that the position of the key upstop rails are still properly set. Because keyframe bedding is one of the first steps in action regulation, it is important that keyframe bedding precede Spirio keyboard calibration.
a. balance rail stud
Keyframe Rest Block
The note solenoids are in a fixed position relative to the keyframe. Therefore the keyframe rest block must not be moved on the Spirio.
a. keyframe rest block
b. note solenoids
Keyframe Shift Stop Screw
Adjusting the keyframe shift stop screw will affect the travel distance of the keyframe and thereby affect the function of shift pedal solenoid. It is critical to calibrate the shift pedal solenoid anytime the keyframe shift stop screw is adjusted. (See Shift Pedal Calibration)
a. New York keyframe shift stop screw
a. Hamburg keyframe shift screw
Sostenuto System
Spirio makes use of the Hamburg style sostenuto system. For regulation procedure, refer to the Steinway Technical Reference Guide - Grand Dampers and Sostenuto.