Yamaha PSR 463 volumn pedal Work around

[Bass to keys]

Is there any volumn pedal that I can use with the Yamaha psr463?
There is no volumn pedal jack, and when I used the output jack to a volumn pedal to the amp, the pedal only went loud to off, no gradual changes

 

[Powerkeys]

Is there any volumn pedal that I can use with the Yamaha psr463?
There is no volumn pedal jack, and when I used the output jack to a volumn pedal to the amp, the pedal only went loud to off, no gradual changes

I don't think theres a functionallaty far that. You could check the manual.