The urc-1056b3 is UEI made remote, not URC which this forum deal with. Yes, both UEI & URC made remotes use the prefix urc- in their remote models. It goes back to 1980's where everyone used those initials for Universal Remote Control. No one could patent it.

Try unlocking the cable device:

1. cable
2. press and hold SETUP for two blinks, release
3. enter 9 8 2, if it blinks twice its locked, if you get four blinks it unlocked. Unlocked you can try other cable codes that might get you the up & down channel commands?