[audacity4blind] Re: latency issues

  • From: Gale Andrews <gale@xxxxxxxxxxxxxxxx>
  • To: audacity4blind@xxxxxxxxxxxxx
  • Date: Mon, 08 Apr 2013 21:22:16 +0100


Is your latency issue the delay in hearing yourself when you 
record? If you plug headphones into the Focusrite don't you 
get zero playthrough latency? 

To be clear, Audacity supports ASIO but due to licensing reasons,
that support cannot be shipped in Audacity releases.

You can compile Audacity with ASIO support as long as you 
agree not to distribute that build to anyone else. Details at:  
http://wiki.audacityteam.org/wiki/ASIO_Audio_Interface .

Compiling Audacity is quite complex unless you are on Linux
(but on Linux you don't get such good screen reader support
in Audacity).

In current Audacity releases you won't get latency much below 
300 milliseconds whatever you set Audacity "Audio to Buffer"

Are you on Windows Vista or later? If so you can try the latest 
"nightly build" from the top of this page:
http://gaclrecords.org.uk/win-nightly/ .

Select "Windows WASAPI" for Audio Host in Device Toolbar. 
This should allow you latencies of about 30 to 70 milliseconds 
with "Audio to Buffer" at 100 milliseconds. You should be able
to reduce "Audio to Buffer" down to about 25 milliseconds 
to get lower latencies still.

These latencies are roughly comparable to latencies you can get
with ASIO4ALL or similar ASIO wrappers for WDM drivers, but
using the above "nightly build" you don't have to compile Audacity. 

WASAPI support is experimental and may give "error opening 
sound device". 

You won't get latencies of 10 milliseconds or less this way. For 
that (at present) you will need your Focusrite to have native 
ASIO drivers and to compile Audacity with ASIO support. 


| From Aidan Maher <aidan.smarttalk@xxxxxxxxx> 
| Mon, 8 Apr 2013 21:40:07 +0200
| Subject: latency issues
> I went even lower then minus 193, much lower, I don't get it to work.
> I didn't try generate the click track for that purpose yet, I can try
> but I don't no if I will manage. I uses a focusrite soundcard wich
> have zero latency. Or at least it should have. The other box is set to
> 100, and in the soundcard control panel is set the buffer lenth is set
> for ten ms, also 100.
> On 08/04/2013, Robbie <tickleberryfun@xxxxxxxxx> wrote:
> > Hi Aidan!
> > To give you an example, I have set the Audio to buffer to 100 and Latency
> > correction to -193. You can approach the ideal setting by generating a
> > short click track and then recording the clicks from a speaker to a second
> > track. By listening to both tracks you can determine the interval between
> > the clicks and adjust the correction values accordingly. When the clicks
> > are very close, it helps to pan the tracks apart, so you can tell which is
> > which.
> >
> > Cheers, Robbie
> > -----Original Message-----
> > From: audacity4blind-bounce@xxxxxxxxxxxxx
> > [mailto:audacity4blind-bounce@xxxxxxxxxxxxx] On Behalf Of Aidan Maher
> > Sent: Monday, April 08, 2013 8:35 PM
> > To: audacity4blind@xxxxxxxxxxxxx
> > Subject: [audacity4blind] latency issues
> >
> > Hello list, so now because of this thing that audacity don't support asio
> > drivers and alike, this create a problem for us who want to record music.
> > Any idea if someone yet developed something to use for a direct low
> > latency? I find that I am having problems with sonar and the scripts, so
> > its good to use audacity for some of the more basic music tasks. And if I
> > don't mis it, someone rote earlier about he have done his album with
> > audacity only, then in that case, how did you handle this latency thing. I
> > set both edit boxes in all different ranges, but stil don't improve the
> > latency. And I was wundering if there is anything I can download to make
> > this work and to communicate directly with audacity and by pass windows
> > onboard latency. If not, I am afraid I must go back to sonar for now at
> > least.

The audacity4blind web site is at

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