Is the Yamaha FC3A sustain pedal fully compatible with all Yamaha digital pianos for half-pedaling, or are there specific models it works best with?

The Yamaha FC3A sustain pedal is compatible with many Yamaha digital pianos for half-pedaling, but it does not work with all models, including some PSR and EZ series keyboards. It is best suited and most effective with Yamaha models that explicitly support half-pedaling functions and have a dedicated sustain pedal input.

How do I fix the Yamaha FC3A sustain pedal if it only starts sustaining after pressing down more than 50%?

If the Yamaha FC3A sustain pedal only starts sustaining after pressing down more than 50%, this behavior is typical due to how the pedal senses pressure, as it is designed for half-pedaling sensitivity. There is no direct fix to make it sustain immediately; it's a feature inherent to its design for gradual pedal control.

Why does the Yamaha FC3A sustain pedal on my Yamaha P-45 only work as an on/off switch instead of supporting half-pedaling?

On the Yamaha P-45, the FC3A sustain pedal may work as an on/off switch if the piano's half-pedaling function is not activated or fully supported in settings. The P-45 requires the FC3A and proper half-pedal settings enabled on the piano to support nuanced half-pedaling.