I was working on the scripted fade operators the other day and ran into an
issue with add using this code:
```
add(normalize=false,[s,blank(duration=5.)])
```
My intuitive idea was to add a blank source to `s` in order to make sure that
the resulting source would run for at least 12s even if `s` ended earlier.
However, this didn't work as expected. `add` actually pumps as much data as it
can and removes all track marks.
I also experienced a freeze in the streaming thread while experimenting with
it, mostly likely because `add` does not currently ticks its child's sources
while pumping more than once.
I suggest that we should change and simplify `add` behavior the following way:
- `add` gets data from each source only once per clock cycle. The furthest
break is kept. If that is a partial fill (track mark) then let it be.
- `add` keeps metadata from all sources. Let the user decide if he/she wants to
silence a source by dropping all metadata on it.
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