Electronics 2000

I have a piece of audio equipment that I am trying to repair without any circuit diagrams. I have traced the signal to a chip labelled "T9649" on the first line and then "2404" on the second line. I cannot trace this 20 pin IC using the normal Google search. Does anyone have any information or data sheet on this?

Thanks, Smudger

I've answered my own question! By tracking down the logo - Analogue Devices - their web site confirmed the number and I then was able to Google a data sheet and it was a quad analogue switch.