Information on factory upgrades, modern component retrofits, and current pricing for Disklavier, PianoDisc, and QRS systems in the Greater St. Louis area.
For owners of Yamaha Mark IV and E3 Disklavier pianos, the factory DKV900 upgrade replaces legacy control boxes with streamlined, modern hardware and current streaming features.
Wireless Control: Eliminates the legacy, knee-level control box. The piano is fully operated via smartphone, tablet, or smartwatch.
Enhanced Playback Precision: Improved low-volume performance and expanded dynamic range for greater expressive detail.
Disklavier Radio: Access to live streaming channels where the acoustic piano reproduces performances in real time.
Price: $3,995 (Includes all parts, installation, and precision calibration)
Contact Us Directly for Pricing Information
If you own a legacy Yamaha Disklavier MKII/MKIII, an older PianoDisc system, or a legacy QRS setup, you are no longer locked out of modern features. The QRS PNO4 Touch engine can be adapted to existing solenoid-driven player pianos.
Universal Compatibility: Replaces obsolete control units on Disklavier, PianoDisc, and older QRS platforms.
Modern Interface: Full web-based control via any Wi-Fi-enabled device without requiring specialized apps.
Legacy Hardware Notice: The factory Yamaha DKC850 upgrade unit has been permanently discontinued by the manufacturer. The QRS PNO4 serves as our primary engineering solution for updating these legacy acoustic player frames.
Unfortunately, the DKC850 upgrade has been discontinued. We are hoping for a replacement upgrade soon.
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The fastest way to reach me is via text. > Because I am often tuning in quiet environments, I can respond to texts much more quickly than voice calls or emails.
Text or Call: [314-236-7841]
Phone & Text Support (Office Hours):
Monday – Sunday: 10:00 AM – 10:00 PM
In-Home & Institutional Tuning: > Monday – Friday: By Appointment