OpenTX - Application Note 04
Creating Audio Files Using NCH Wavepad
Before recording your voice, ensure the background is as quiet as possible, without fans or other appliances running. Put the microphone close to your mouth but ensure you do not breath onto it when you talk.
Before recording, test the recording level. If the recording amplitude is distorted, repeat with the level reduced. Ensure your voice does not put the level meter into the red region.
Press record, say the phrase and press stop.
Delete any gaps at the start and finish. Delete long gaps between words.
- To select part of the recording for deletion, first click and drag across the part.
- Click ‘Delete’ to delete the selection.
To maximise the volume without distorting it, select ‘Effects / ‘Normalize’.
Convert the file to Mono using ‘Edit’ / ‘Convert Channels’ / ‘Mono’.
Select ‘Edit’ / ‘Convert Sample Rate’ and select 32000 samples per second.
Select ‘Save File As’. Enter the file name, select type Wave (*.wav) and click Save.
The file is now ready to be transfered to the SD Card in the Taranis radio.
Audio files are stored on the SD card in the [SOUNDS]/[en] folder. Ensure the filenames are no more than eight characters long with a .wav extension.
The audio files can then be played by a Special Function with the ‘Play Track’ function. For example, this special function plays the file ‘flapdown.wav’ when switch SG is switched to the down position.
The file ‘flapdown.wav’ is already in the standard list of files that comes with OpenTX. It says “flaps down”.