@garybuchanan there was a revision of the dock connector between those models. Your iPod Classic may not respond to your remote because of that. I remember that there were the same issues with some Bose docks for the same reason.
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Of course, it is also possible that this is related to some missing firmware etc. After all "The remote control, iTalk and other serial devices use the Apple Accessory Protocol for communication with the iPod. This protocol was introduced with the 3rd generation iPods, and is also compatible with the 4th generation iPods and mini iPods. The connections uses a standard 8N1 (one startbit. 8 data bits, one stop bit) serial protocol, 19200 baud (higher rates up to 57600 are also possible, but speeds faster than 38400 may cause problems with large amounts of data), with a delay of 12 microseconds inserted between the end of the stopbit and the beginning of the next startbit (also works without this delay)." from [https://pinoutguide.com/PortableDevices/ipod_pinout.shtml |here]
@garybuchanan there was a revision of the dock connector between those models. Your iPod Classic may not respond to your remote because of that. I remember that there were the same issues with some Bose docks for the same reason.