Digital Auto-Tuning and Digital Memory for the Yamaha CS80

via gavincurtis on the Yamaha list:
"Been experimenting with a prototype digital tuning add-on for the CS-80. A small micro-controller board calibrates all critical oscillators to a reference crystal via serial data controlled trim-pots on demand. Never have to open the unit up again for tuning.

Also working with a memory preset system which has been a challenging design concept so far. Like the auto-tuner, is a relatively compact circuit board that fits into the case of the CS-80. A low profile remote user panel fits to the underside of the micro-slider memory cover via a 4 conductor ribbon cable. The add-on is only visible when the cover door is open.

You program the keyboard as you normally would by adjusting the micro-sliders to obtain the desired sound. Then select any one of 999 available memory locations and instantly store that setting into digital memory. You can also copy any store sound settings in your library to a row of 5 "radio preset" buttons for instant performance presets. A 2nd identical digital storage interface is directly below and is for the 2nd set of micro sliders... so nearly 2000 presets could be stored.

The memory preset system has it's own internal bank of digitally controlled trimmers that exactly mimic the control panel sliders. Imagine if each micro-slider had a twin internal motor driven slider controlled by a computer.

The memory preset system records the slider positions you set with your fingers and stores their positions into any one of the 999 spaces in the FLASH memory. Simply call up any of the (up to 999) memory locations, the internal pots instantly move to the desired positions.

Technical to install, but would be very clean. It could also be removed at a future date and keyboard returned 100% to its original state if desired."