It's a matter of changing the values of the resistors near the
attenuator switch in the rear right-hand side of the upper board. I
think you can find the value changes in the "Files" section of the
Yahoo R-1000 user's group. I only changed the section for shortwave in
mine. I left the LW/MW attenuator resistors as they originally were.

Frank
K3YAZ
Tucson