An acoustic control system for an electronic musical instrument, which can obtain
optimal acoustic characteristics irrespective of whether or not a low range speaker
is attached to a body thereof. A piano body has high range and mid range speakers.
A low range speaker is removable from the body. A stand-excluding switch designates
a first speaker-use mode for using the high range and mid range speakers alone,
and a stand-including switch designates a both speaker-use mode for using both
the high range and mid range speakers and the low range speaker. A ROM stores stand-excluding
and stand-including factors for setting acoustic characteristics in the two modes,
respectively. A CPU reads one of the factors, which corresponds to the mode designated
by the stand-excluding or stand-including switch. A tone generator circuit generates
a musical tone signal to be reproduced in one of the modes, based on the read factor.
