Yamaha RX21 - Manual (Page 35)

All songs in memory (songs 0–3) may be cleared simultaneously if desired. This
is a "hidden function" in the sense that it cannot be accessed directly-in order to
prevent accidental clearing of the entire song memory contents.
First, press the CLEAR button from the song select mode (in this case, the song
number selected is of no importance). When the "CLEAR SONG s ?" display appears,
simultaneously press the CLEAR and SONG PLAY buttons. The LCD will switch
to "CLEAR ALL SONGS?". If you decide you don’t want to clear all songs, press
the -1/NO button to cancel the clear function.
If you want to clear all songs, press the +1/YES key. The LCD will show the "ARE
YOU SURE ?” display, to give you a second chance to confirm your intention to
clear all songs. Again, If you decide you don’t want to clear all songs, press the
-1/NO button to cancel the clear function.
If you are sure you want to clear all songs, press the +1/YES key. The LCD will
show the “ALL SONGS CLEAR" display, followed by the “SELECT SONG s" display.
The "clear all songs" function initializes (zeros) the song memory, and can be used
to restore normal operation should an operation error cause the RX21 software to
malfunction. It’s advisable to save the contents of the song memory onto a cassette
tape (see the CASSETTE OPERATIONS chapter) to prevent loss of songs you
wish to keep.
Song Clear (AIl Songs)
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