Allen Organ Company Renaissance 230 Owner's Manual page 11

GENERALS: continued
Tremulants Full
Console Speakers OFF Used to switch off the Console Speakers.
External Speakers OFF Switches off all external speakers (if installed)
R-230, -250, -270
When activated along with one or more of the organ's
tremulants, this control causes the tremulants to become much
deeper than normal classical tremulants.
music, etc. Also known as "Vibrato."
8
Useful for Gospel
SECTION II