RD-500: Using an RD-500 with an external module
When using the RD-500 with an external sound module, you can toggle between the
two sound sources by setting the RD-500 LOCAL switch to [on1], and using the
UPPER and LOWER TX buttons to transmit.
To set the RD-500 to LOCAL "on1."
1) Press the FUNCTION button so it is lit.
2) Press the LOCAL button.
3) Use the DEC and INC buttons to select "on1" in the window.
(The manual says that the RD-500 defaults to LOCAL "on1" when first turned on,
however this is incorrect.)