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MixAudio - Avisynth wiki
http://avisynth.nl/index.php/MixAudio
MixAudio(clip clip1, clip clip2, float clip1_factor, float clip2_factor) . Mixes audio from two clips. A volume factor for the two clips can be given, but is optional.. clip clip1, clip2 = Source clips. Output video is copied from clip1. float clip1_factor, clip2_factor = (auto) Set the volume of each clip's audio, where 0.0 is no audio from that clip, and 1.0 is 100% audio.
AudioDub - Avisynth wiki
http://avisynth.nl/index.php/AudioDub
From Avisynth wiki. Jump to: navigation, search. AudioDub (video_clip, audio_clip) AudioDubEx (video_clip, audio_clip) AudioDub takes the video stream from the first argument and the audio stream from the second argument and combines them into a single clip. If either track isn't available, it tries it the other way around, and if that doesn't ...
AviSynth Audio Overlay - VideoHelp Forum
https://forum.videohelp.com/threads/323256-AviSynth-Audio-Overlay
Actually, the only times I really use Avisynth mixing is to downmix to stereo or mono. For overlaying commentary tracks I use Audacity; so I was thinking like that, as mixing silence + track in Audacity causes no change in volume. Perhaps this method, which I actually use, might be helpful:
TimeStretch - Avisynth wiki
http://avisynth.nl/index.php/TimeStretch
In upcoming AviSynth v2.61 an updated SoundTouch library is used which supports multichannel audio. AviSynth v2.60 and below support stereo only. See the thread TimeStretch in AVISynth 2.5.5 Alpha - Strange stereo effects? for details.
MergeChannels - Avisynth wiki
http://avisynth.nl/index.php/MergeChannels
Merge the audio channels of two or more clips. There is no mixing of channels – MixAudio and ConvertToMono do this. The channels are added to the new clip unchanged. MergeChannels(clip clip1, clip clip2 [, clip clip3, ...]. Output video, framerate and running time are taken from clip1.. All audio is converted to the sample type of clip1.. For example, given the following source clips:
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