AI, which isn't always accurate, offers these suggestions. Give them a try...
"To lower the volume of the soundtrack when a video clip with sound appears in NCH PhotoStage Pro, you can use the Audio Ducking feature. Here's how:
Enable Audio Ducking:
- Right-click on the audio clip in the sequence.
- Select Suppress Volume of Soundtrack Behind this Sound Clip. This will automatically reduce the volume of the background soundtrack when the video clip's audio is playing.
Adjust Audio Ducking Settings:
Go to Options -> Audio Tab to configure settings such as:
Ducking Fade In Length: Time over which the volume reduction begins.
Ducking Fade Out Length: Time over which the volume returns to normal.
Ducking Threshold: The volume level at which ducking is activated.
Alternatively, you can manually adjust the volume:
Manual Volume Adjustment:
Right-click on the soundtrack clip in the timeline and select Adjust Clip Volume.
Use the slider to lower the volume of the soundtrack during video playback.
These methods allow seamless blending between your soundtrack and video clip audio."