The Audio Panel sets the audio volume, and lets you choose which CHOP provides the audio waveform data for the animation timeline for lip syncing. You can access the Audio Panel it by selecting it from the Windows drop-down menu or by pressing Alt + I.
This panel controls the audio that Houdini provides to the operating system. The operating system may do further processing or volume adjustment to the data before sending it to the speakers.
Audio output controls
Do not play audio.
Audio plays when during playback and when you scrub on the timeline.
You might want to disable 'Playback/Integer Frame Values' in the 'Global Animation Options'.
Audio scrubbing is more precise when the scrubbing can change time in small steps.
The options below the Timeline radio button control how audio plays when you scrub along the timeline.
When you hold the play head still while scrubbing, the audio will repeat around that frame.
Controls the length of audio played when repeating. Higher numbers give shorter bursts of audio. (30 means 1/30th of a second, 45 means 1/45th of a second).
Controls the length of audio played around each frame you scrub to. Higher numbers give shorter bursts of audio (30 means 1/30th of a second, 45 means 1/45th of a second).
Plays a CHOP whose Time Slice option is on (forwards only).
Audio Output Delay
The delay applied to the audio output.
Lets you play audio independent of the audio timeline.
These buttons are similar to the ones on the playbar. See playbar help for more information.
On Change Rewind
Restarts the audio when a change is made.
Output audio on only one channel.
Lock the volumes of the left and right channels together (changing one changes the other). When this option is off, you can set the volumes of the left and right audio channels independently.
Turns on the live-updating VU meter.
Displays the current volume of CHOPs audio output. The green area represents output between -1 and +1. The red zone represents output outside -1 to +1, indicating the waveform is being clipped.
L and R
Control the volume of the left and right audio channels. When the Tie checkbox is on, these sliders are locked together.
Get the audio output from a channel operator (CHOP). Click the + icon to choose the CHOP from your network hierarchy.
Get the audio output from a sound file. Click the + icon to choose the file.
Audio Second … is at Frame
When the audio source is File, you can use these options to sync the sound file to your animation. To start the output later in the sound file, increase the Audio Second option. To start the output later in the animation, increase the is at Frame option.
You can also use the audiopanel HScript command to control audio output.