If this is a 128 that is that old then this is the original pre-silent drive "blue board" system. I would highly encourage the customer to upgrade to the new system if they use the player regularly. This primarily involves changing out the circuit boards and updating the software. The improvements in expression and performance are a thousand percent better. The player system should have no effect on the feel of the action provided that it was installed properly. I would suggest a complete regulation job. That in itself will make a world of difference and should make the client happy. Then have a certified PDS tech drop the rail cover and do a general going over on the player system. I think you will find that it will be a completely different piano. As far as the pedal squeak goes this suggests that there could be some finer details that the installer neglected. This shouldn't be a big deal to figure out. Unless the system is equipped with the record option there are no components under the keys. Even if it did, the record system is mounted on the frame and would not be effected by the shift pedal. Rob Goodale, RPT Certified, (and very busy) PDS installer Las Vegas, NV
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