Can Audacity create its own libraries of AUs (from Logic)

Sorry, if this is totally stupid, I am a real idiot, when it comes to computer-engineering…

I have Logic 8 and read that Yosemite does not even support Logic 9, because Yosemite uses cocoa libraries and the previous Logic libraries are a mixture of cocoa and carbon libs.
So I was thinking, if Audacity maybe can use the audio files (the file for every note step for every instrument) and make its own library, so that Audacity knows note e of violin is there, note e-sharp of violin is there and so on?

The reason I ask is, that I don’t want to buy Logic X for Yosemite. I guess it is wrong thinking, when I assume I could fully replace Logic 8 by Audacity, right? I’ll definitely be missing functions, right? (My only option is when buying a new Mac, I will have to do so, that the Mac still supports 10.8 (for Logic 8) or 10.9 (for Logic 9 Upgrade, right?)

I hope somebody here has Logic.

I don’t think Audacity “knows” anything about violins. The best you can do is analyze a musical note—by hand—and tell that it’s probably Bb. And that only works when the note is playing by itself. If you’re in the habit of splitting individual instruments off from each other in a mixed performance like orchestra or band, we’re not particularly good at that.


The current (2.0.6) version of Audacity has a similar problem. “Audio Units” (AU) effects are not supported by Audacity 2.0.6 with Yosemite because of this cocoa/carbon stuff. The next version of Audacity (2.1.0 which is due for release within the next couple of weeks) resolves this problem, so AU effects should work.

That depends on what you are wanting to do. Logic Pro is a full blown digital audio workstation (DAW), whereas Audacity is a multi-track audio editor. Audacity is extremely capable when it comes to sample editing - probably more so than Logic, but if you want to use features such as MIDI control, software synths, real time effects, or other advanced DAW features, then Audacity is not the right program to use.

Audacity can’t do that. I don’t think that Logic can either, can it?

Re the last question, no it can’t of course, because there you just select the instrument. But back then, I thought, that maybe Audacity could use it, if it would make its own library out of it in order to use the AU.

Some clever Russians seem to have audio-to-midi worked out:

Never used it myself.

Forgot to answer that one.
What I need from Logic, that I can’t use in Audacity is the AUs hence the question. The only other things I use are simple pitch manipulation, time-correction, simulated guitar amplifiers, effects like distortion and sound-equalizers.

I use Audacity, when I have to quickly record something (much like an old cassette recorder or dictaphone) or when I want to digitalize LPs or cassettes.

An AU file in Audacity is a few seconds of stored digital audio data. It is not MIDI.

If you have MIDI data Audacity cannot do anything with it unless you convert to an audio format like WAV or AIFF or play it in Logic and record it into Audacity. If you just want a few seconds of audio here and there it may be easier to record into Audacity.

Have you tried looking at this Logic Pro 8 User Manual - Apple? Look at either Exporting or Bouncing. For either export or bounce, save as WAV 16-bit 44100 Hz.

As I understand it, exporting won’t include any “send” effects. When you “bounce” you get what you hear in Logic.

If you want a video try this: You Tube Logic Pro: How To Export MIDI to Audio.

I do not use Logic. If you need help using Logic, please ask on their forums, not here.


Ehm, not sure, if you understand what I wanted to say.

If you search for strings on your hard drive, you will find the folder “strings” and in it there is an aiff audio file for each single note that is possible to be played by strings. It is a short audio file made from recording string actually playing every single note sperately in the studio.
These like 60 or what do I know single notes will be used by Logic to give out the sound you are playing with a keyboard or you typed in a score.

It is not these peep sounds that are meant to sound somewhat like strings, but actually sound like an Arcade console computer game.

I know, I can manually just locate the pre-existing aiff audio file that came with the installation of Logic for the note “c” on the HDD, cut it to the length I need it and import to Audacity and repeat these steps for every note/sound again. But since this will take hours, I asked whether it is possible to let Audacity learn a database of sounds. That was what I wanted to know. I know now, it is not possible.

But thank you for the links!

What you want is far from impossible.

It’s only relevant to those who use a Mac AND have Logic installed.

You don’t expect a lot of development effort only for Logic owners only, do you? It would be somewhat strange, because if you bought and use Logic, why would you want to use Audacity?

So are your trying to build a melody from these AIFF files?

If that is what you are trying to do I think it comes down to the solution I gave - bounce/export or record the melody from Logic.

If you don’t want to buy Logic for Yosemite, then you’ll have to find some other app that supports synth/instrument plugins or has built in melody generation. Audacity does not.

The nearest we can get is for you to save the AIFF’s as an Audacity project so you have easier access to them, and possibly you could use this Nyquist Sequencer See here for how to install Nyquist plugins