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Try this first with the piano off, run the control from stop to stop rapidly several times. The object is to clean off any dust deposits and shine the contacts inside the pot. If the pot is not damaged beyond repair, then this should fix it.
All i can suggest is to use electrical contact cleaner on it from the inside. But you,ve already done that. And i would imagine that the master volumes will be the same to, Harry
If the volume control is analog (meaning it is an old rotary and not digital) - it may just require cleaning.
Pick up a can of electronic switch cleaner.
Just spray a few shots but you have to take the top cover apart, then take out 3 philips screws in the pots module, take off caps and then you should be able to give'em a good cleaning spray shots.
Beofore you replace it, if it is only scratchy give it a good working by sliding it back and forth a rew dozen times. (if it is a slider type) If you can get some electrical contact cleaner with a thin plastic tube, try squirting that into it and work it again, if that fails, then look at the volume control replacement.
try a differrent speaker of suitable wattage and ohmage (displayed with a number next to a ? symbol on the back of the speaker),
or
remove the original amp speaker and gently push in and out on it, checking for uneven resistance or scratching. the speaker should retract and return smoothly, without any scratchiness or uneven resistance from within, and if there is any of this scratchiness or uneven resistance from within, the speaker is likely damaged from too much wattage or distortion.
First try spraying a bit of CRC226 (aaaaaa9make sure it is 226 as there are other products with similar numbers there)available at Home Depot in the electrical dept. into the control where the leads go into it. You may need to bend the plastic spout of the spray can at 90 degrees near the end to get it to go up into the control. This has a high probability to solve your problem.
Getting replacement controls that exactly fit are a major headache from anyplace than the original manufacturer.
Try cleaning your volume potentiomenter with contact cleaner (they come in spray can's), the scratchy sound is audible when you turn your volume control on, the contacts inside your potentiometer accumulated dust or some other particles.
The distorted and low volume output plus noise is usually caused by using the wrong power supply adapter. The Alesis SR-16 takes a 9V "A/C" supply not "DC". The A/C supply provides a negative voltage swing which wouldn't exist with a DC supply. So check and make sure you have 9V A/C output supply not DC.
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