Uncle Dave,
I will use the keyboard only in my apartment, and since I have read that speakers on PA500 are not great, I was thinking that I can have better sound quality with guitar amp. May be speakers are good enough for home use, and I have also read that guitar amps are not as good as keyboard amps.

Yes, I meant if I can use processor pedal as sustain pedal. So, I can not. It looks the guitar processor can not be of much use with keyboard.

My guitar amp has only input, but I think it is the amp that activates the pickups in guitar, so does this mean the guitar amp has some kind of output signal through the input jack?

So, can I use the guitar amp with keyboard, and if yes, should I use the phones jack on keyboard, or the output one? I think both should be the same.

Thanks.