Akai DD1500 User Manual page 82

11 - RECORDING
You will note that when you are set up to record digitally and tracks are selected for
record, should you go to the SYSTEM page and attempt to select a different wordclock
sync source, you will receive the prompt:
However, if no tracks are selected for record, you may select a different wordclock sync
source but, when you select tracks for record, the DD1500 will automatically switch from
the newly selected wordclock source to the digital audio input.
Page 74 Version 2.00 - March, 1996