Thanks to Owner-Manuals.com! This manual was exactly what I needed. As Amana was purchased by Maytag and later by Whirlpool, there was no way to receive it from their websites. I was lucky to find this resource.
Great to be able to set channels again, on an old but stoll fine working TV
Text excerpt from page 17 (click to view)
Operation 4. Press the SELECT button to select the memory (number) to which you want to store the sound. The indicator for the selected MEMORY number flashes.
fig.22a
Blink
Blink
5. Press the WRITE button. The write operation is completed when the MEMORY indicator and the indicator for the write-destination memory begin to flash more rapidly.
fig.23
Blink
Writing
Write finished
Blink rapidly
Lit
* If the knob or the MANUAL/MEMORY pedal position is changed before the WRITE button is pressed, the write operation is cancelled, and the CE-20 is returned to the status in effect in Step 2.