I haven't seen one, but I'm having issues with what could be an unstable clock in my Roland VS2400 or my Eclipse. When connecting optical out of the VS to my Eclipse, I have to engage the Eclipse's SRC. Otherwise, the status shows as "drifting". But if I connect my Eclipse's optical out to the optical in of the VS2400, the VS keeps frequently (and not always immediately) stating "digital in UNLOCK". I'm guessing at this point it must be the VS2400 that has a dodgy internal clock. Just to put my mind at ease, is there a diagnostic on the Eclipse that tells me whether the optical i/o is working properly? I've only seen this kinda thing on a TC Electronic Finalizer.