Carver Controller

Hello. I'm new to the forum but have been an avid carver and sunfire fan/customer since 1984 when my first audio equipment purchase was The Carver Receiver. I have a problem I'm hoping someone can help with. I have a Carver Controller, which is a multi-zone home audio controller/amplifier, manufactured for Carver, I believe, by Rotel. I have the original remote, and want to be able to transfer the codes to a L5 universal remote. Some remotes will accept the codes, such as Universal, others will not, such as the L5 and Logitech. I think I need to convert the codes for the Controller to another format (Pronto Hex Codes?) to get them to work, but I don't know what the codes are or how to convert them. The codes would be for volume, standby, and source 1-4. Can anyone help?

You don't need the codes, all good universal remotes are also learning remotes.