Thanks, Fran for giving a general size. Thank you, Uncle Dave. I brought up the link again and this time, I saw the image. I am still surprised that they don't list the size of the unit. Fran, how much power does this increase the mic volume? Looking at this unit, I am assuming you would put the quarter inch plug in the mic input and from looking at the unit, Channel 2 would be the volume control. Going out of the unit would be a cable using a quarter inch plug with a quarter inch plug into the keyboard. Right? Also, is there any noise by the mic volume being increased into the keyboard? As I have stated, I have never used any device like this for gain of any type. Thanks.

Mark