[LAU] Building a DAW

[Ricus Vincente]

On Tue, 2009-06-02 at 15:28 -0400, Paul Davis wrote:

> > Is that sync with varispeed ? If the analog machine
> > runs 0.5% slow because it has been a long day, will
> > Ardour do the same, and without loss of quality ?
> 
> there are "hidden" options. the default settings assume that the
> timecode source and the audio interface that is driving JACK share a
> sample/word clock, so that 1 second of timecode time == 1 second of
> audio samples, and thus no varispeeding is necessary. essentially, we
> just notice that timecode starts, stops and jumps non-linearly, and
> respond appropriately.
> 
> however, you can change this setting (there is no GUI for it because
> i've yet to find anyone who can actually defend adding this option to
> the GUI), and in that mode ardour will varispeed to stay locked to the
> master. it will stay locked to within 8-30 samples of the master's
> timecode position. the varispeed interpolation (linear, fixed point)
> is weak, and so technically quality will suffer. whether its suffering
> worth fixing is a matter that reasonable people might reasonably
> disagree about.
> 
> when i initially developed MTC slaving, i used an Alesis M20 ADAT
> *without* sample/word clock sync. ardour would follow the wow+flutter
> of the M20 perfectly. it would even follow it if i used the
> shuttle/scrub controller on the M20.

 Sounds like it will work for me.

 Rich...