Audacity Forum

billw58 wrote:"Quick Mix" is in Audacity 1.2. You should consider upgrading to 2.0 here: http://audacityteam.org/

(hzosc 440)

(scale 0.5 (hzosc 440))

(scale 0.2 (hzosc 220))

(sim
  (scale 0.2 (hzosc 220))
  (scale 0.2 (hzosc 330))
  (scale 0.2 (hzosc 440)))

billw58 wrote:Please do not double-post. It doesn't get you help any faster. I've deleted your duplicate post from the Audio Processing forum.

"Quick Mix" is in Audacity 1.2. You should consider upgrading to 2.0 here: http://audacityteam.org/

That said, Quick Mix is the way to go, but you probably got clipping. Examine your mixed track at full zoom (so you can see the individual samples) - you'll probably see the tops and bottoms of the wave flattened off.

Generate each sine wave with an amplitude of 0.2, then do the quick mix. The resulting mix will have a maximum amplitude of 0.5. Select the entire mixed track and do Effect > Amplify to bring it to maximum amplitude.

-- Bill

steve wrote:

billw58 wrote:"Quick Mix" is in Audacity 1.2. You should consider upgrading to 2.0 here: http://audacityteam.org/

Audacity 1.2.x is obsolete - you unless you are using an ancient computer (e.g. Windows 98) you should definitely consider upgrading.
Upgrading from Audacity 1.2.x to Audacity 2.x is very easy, you can either uninstall the old version first or just install the new version over the top. Personally I'd recommend uninstalling the old version first but I don't think that it really matters.

An alternative method to that described by Bill is to use the "Nyquist Prompt" effect (Effect menu).
"Nyquist" is a programming language that is included in Audacity and you can do all sorts of cool stuff with it.
To use Nyquist commands in the Nyquist Prompt, either type or copy/paste the required code into the text box in the Nyquist Prompt effect.

To replace the current audio track selection with a 440 Hz sine wave you can use the command:

Code: Select all

(hzosc 440)

This produces a full amplitude (0 dB) waveform.
To make a smaller waveform it can be scaled like this:

Code: Select all

(scale 0.5 (hzosc 440))

This will scale the generated waveform to a level of 0.5.

To scale to a level of 0.2 with a frequency of 220 Hz you could use this code:

Code: Select all

(scale 0.2 (hzosc 220))

To generate 2 or more tones simultaneously (mixed) you can use the "SIM" command.
Example, to produce tones at 220, 330 and 440 Hz, each with an amplitude of 0.2:

Code: Select all

(sim
  (scale 0.2 (hzosc 220))
  (scale 0.2 (hzosc 330))
  (scale 0.2 (hzosc 440)))