Kdenlajv it already it is very well modified for this job.
But there are no some functions.
1. Balance between channels/Possibility to muffle one of channels
2. The indicator of level of a sound
(audio channels mixer)
3. (video titration) On a background to lay not the static image, And sequence of shots targa/tiff/other
4. Possibility to impose effect on a path (timeline) (not a clip)
These functions can appear in the program?, Approximately when?
PS Forgive for my English translator
PPS Many thanks to all developers and accompanying kdenlive!