[jokosher-devel] Volume fades UI

["Stuart Langridge" <sil kryogenix org>]

> > What I always planned to do was, once you've dragged one of the
> > fademarkers, lock the other one so you can't drag both sides.
> >
>
> Unless I am misunderstanding you, this does not fix the problem. If
> you select the middle portion of an event and then drag the right-hand
> side fademarker, the portion from the right side of the selection to
> the end of the event gets its volume decreased as well. I think it is
> more intuitive that the fademarkers only ever make changes to the
> portion of audio that is selected, no?

That idea seems initially attractive, until you think it through. If
you do that then there's a fade down and a sudden volume jump back up
to where it was before at the end of the selection. To a first
approximation, no-one wants to do that. Note that you can, if you want
to, jump the volume back up by making a small selection. The current
design is based around the idea that "fade out the current sample and
keep it faded" (which I'll call fade1) is a relatively common thing to
do, and "apply a fade to a bit  of a sample and then have the volume
jump back up after that bit" (which I'll call fade2) is a relatively
uncommon thing to do. Both these two things are possible with both
methods:

My fade implementation (volume stays faded outside the selection),
user wants to apply a fade out to a sample (fade1):
1. Make a selection starting where you want the fade to start and
finishing where you want the fade to finish
2. Drag the right hand fademarker to 0%

My fade implementation, user wants to apply a fade out that applies
only to a part of the wave and have the rest continue as if no fade
had happened (fade2):
1. Select the part you want to apply to
2. Drag the right hand fademarker to 0%
3. Make a new, very very narrow selection, starting at the right-hand
end of the previous selection
4. Drag the right hand fademarker back up to 100%

Your proposed implementation (fades only apply to selected part), user
wants to apply a fade out to a sample (fade1):
1. Select the part where you want the fade to happen
2. Drag the right hand fademarker to 0%
3. Select everything from the right-hand edge of the current selection
to the end of the sample
4. Drag the left fademarker to 0%
5. Drag the right fademarker to 0%

Your proposed implementation, user wants to apply a fade out that
applies only to a part of the wave and have the rest continue as if no
fade had happened (fade2):
1. Select the part where you want the fade to happen
2. Drag the right hand fademarker to 0%

I agree entirely that your proposed solution makes fade2 easier.
However, I don't think that people do that as much as they do fade1
(make a sample fade out and stay faded out), and therefore the current
design makes fade1s easier. Opinions requested.

sil

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--
If hard data were the filtering criterion you could fit the entire
contents of the Internet on a floppy disk.
            -- Cecil Adams