If you're having trouble with different audio coming out of your television - Spanish, Visual Descriptions or Text to Speech, it is because your TV has been set to receive the Secondary Audio Program (SAP), when it is available.
Most shows and commercials do not have a secondary audio program, and your TV defaults back to primary audio when there is no signal, so your TV could have been set to this for a long time and you've never noticed until something strange happens.
KOAA carries the alternate "SAP" channel for verbal descriptions for the visually-impaired. The number of programs offering this has increased, and the SAP channel has now begun carrying automated “text-to-speech” read-outs of severe weather warnings and similar emergency information.
If you do not wish to hear SAP audio, the problem can be fixed from your TV remote control (or the remote for any set-top boxes you may use to tune in channels on your TV). There is usually a small button right on the remote control that toggles the sound between ENGLISH and SPANISH, and the TV usually puts text on the screen to indicate which is selected when you push it. That button is often what has been accidentally pushed, and that's what will take you back to the main audio channel if you push it again once or twice.
Sometimes the button can be labeled "AUDIO", "LANG", "SAP", or "MTS". On some cable boxes, the switch is not made with a button on the remote, but is done in the on-screen setup menu. You may need to consult the manual for your television, or technical support from your cable/satellite provider, for further information.