AGFA 307 Owner's Manual page 45

To set the white balance manually :
1. Turn the WB/ASM mode switch to white balance (WB).
2. While pressing the mode button, turn the control dial until the
desired indicator blinks in the data panel.
The blinking WB mode is selected when you release
the mode button (the other WB indicators will
disappear).
Pressing the program reset button returns the camera
to the auto white balance mode.
When using the built-in, or a dedicated flash, the
white balance is automatically set to flash mode.