This Lexicon PCM41 does not pass delayed audio and does not respond to button pushes.  It does power up and pass dry audio.  It has some major mods done that we have never seen before, please see the pics.  Some knobs were removed for the mods.  Many of the outer metal cover screws are missing.  This could be for you if you need parts or know how to fix these.  Sold as is with no returns since it's not working.