Master Volume set to minimum, sound still comes through..??

I just picked up a used 2500 today. Everything seems to be working fine except for a couple of marginally "sticky buttons" on the right hand side - but when I have the master volume set to zero sound comes through the main outputs and the phones output if I audition samples or play samples from a loaded program.

Anyone ever experience this?

sounds like you may need clean up under the hood a bit, for audio leaking you may be looking at replacement of volume pot. sticky buttons, possible dirt build up or tact switches going bad... detoxit may may restore the mechanics of the buttons after you clean it out.

hope this helps