Audacity Forum

nelsona wrote:So just to be certain, Audacity's developers are simply using C++'s rand function, correct?

If by "C++'s rand function" you mean "std::rand", then yes.

You can see the code in EffectNoise::ProcessBlock here: https://github.com/audacity/audacity/bl ... /Noise.cpp

How about something like this (in pseudo code): DO [from pitch-type = 0 to pitch-type = 1] { IF [pitch-type == 0] pitch = 1000 ELSE pitch = 4000 DO [from gain = 0 to gain = -45 | gain = gain -5] { DO [10 times] { PUT (pitch, gain) INTO parameter-list } } } RETURN parameter-list So what we end up wit...

The effect that you are describing is called "amplitude modulation" or "tremolo" (two names for the same effect). "dB" is a ratio rather than an absolute measure. "80 dB" is meaningless without defining a reference level. For audio signals, the usual reference...

FL2070 wrote:I'm sorry, I forgot to mention I don't use the installer due to permissions issues.

Perhaps that's the problem. What are the "permission issues"?

PiTeRr wrote: my final issue is to create a sequence of 100 tones at frequency of 1000 Hz and 100 tones at frequency of 4000 Hz and all of this should be shuffled.

What are your thoughts about how to do that?

Select the part that you want to delete in one of the tracks (see here for various ways of selecting audio: http://manual.audacityteam.org/man/auda ... ction.html)
Then press "Ctrl + Shift + K" (or "Edit menu > Select > In All Tracks")
Then press the Delete key.

BobLSL wrote:I have a 6 track loaded audio file.

Are the 6 tracks stacked one above the other, all starting at "time = 0"?

With Audacity 2.1.3, to import stereo sample data: 1) Add a stereo track (Tracks menu > Add New > Stereo Track) 2) Select part of the track (click somewhere near the middle of the track and drag to the start so that there is a highlighted selected region. 3) You should now be able to use Sample Data...

If you are using Audacity 2.1.3 you may be hitting a bug in Nyquist.
A result of the bug is that for stereo, it is necessary to have an actual time selection in the stereo track.

The bug is fixed in the current development code.

nelsona wrote:I was wondering if someone (an Audacity developer preferably) could tell me what sort of random number generator / seed is being used to generate the White, Pink and Brownian noises within Audacity?

std::rand