4 AUDIO VIDEO COMBINE

For personal use. Joins videos with audio. Still testing.
Note: It does not work with videos that have no audio.
If you must use a video without audio, use the silent audio file set first in "AUDIO+" to make it a video with audio before using.
Initial fps 30. Can be changed.
Volume of each video can be adjusted. Variable 0-1, where 1 is 100% volume.

If not all load slots are filled, blank slots will be filled with the 1st file instead.