On Sun, 27 Jan 2013 19:25:02 +0100 (CET)
Holger Marzen <[email protected]> wrote:

> On Sun, 27 Jan 2013, Lorenzo Sutton wrote:
> 
> > On 26/01/13 19:35, Holger Marzen wrote:
> > > On Sat, 26 Jan 2013, Abrolag wrote:
> > >
> > 
> > [...]
> > 
> > > I encounter that's made with Rosegarden or other Open Source
> > > Software avoids instruments that need exact timings.
> > 
> > Sure it's so general? Isn't this doable by setting JACK latency low? I 
> > thinking of Rosegarden doing only midi and hooking instruments (e.g. 
> > fluidsynth) through alsa-midi etc.
> 
> It's noticable when using effect plugins.

I've changed the subject line because the intention of my original post was to
give the hard-pressed devs a bit of a lift, and this discussion is detracting
from that.

In the case of my recording, I would say that any latency is more likely to be
a function of my playing live, and not being as good as I'd like to be!

However, in general you are not comparing apples to apples. By their very
nature many effects deliberately introduce delays in order to function.

The most extreme example I know of is fast lookahead limiting. It side-chains
a control signal then delays the main path (typically about 20mS) in order to
apparently perform time travel and start to adjust the level before the spike
hits.

The integrated DAWS you get with Windows and Apple have default, fixed sets of
effects that they know the precise conditions of and can therefore actually
advance recorded tracks based on this precise knowledge. Try using unknown
plugins and the situation changes.

Without knowing the precise details of every effect you could plug in
Rosegarden has no hope of doing this. In practice I've never found it a problem
as it is easy to just jog a track left or right until it is correct.

There is also a pseudo-latency effect you can get if you mix slow attack sounds
with fast attack ones (something I do a lot of). I find that usually just one
'Jog Left' in the matrix viewer is enough - thank you very much whoever had
that bright idea!

-- 
Will J Godfrey
http://www.musically.me.uk
Say you have a poem and I have a tune.
Exchange them and we can both have a poem, a tune, and a song.

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