We do have a few reports of “choppy” or “stuttering” playback in 2.0.4 on OS X , but the problem is not reproducible on any of our machines.
Without hearing the condition that others have described as “choppy” or “stuttering”, I cannot say if this is the same issue I’m experiencing. What I’m hearing is a crackling / clicking during playback. Other than the inclusion of this noise there is no other affect on playback continuity. Also, please note that the condition I’m reporting happens in 2.0.4 and 2.0.5. The only thing that changed between the two is that 2.0.5 no longer crashes on opening a file.
So I hope you won’t mind a few questions.
What application produced the problem files? Are you using Soundflower?
While I’ve not set up an exhaustive control group to check, Logic, iTunes, Peak, Reason and Ableton Live files were imported into Audacity. So far every audio file I’ve opened in the program has this defect. The only time I’ve heard something similar to this is when I’ve had buffer settings too low while recording in Logic. However, I’m not recording in this case and I’ve tried several buffer settings in Audacity just to be thorough.
If you import audio into Audacity that sounds OK in other players, then export it from Audacity as 16-bit WAV at 44100 Hz project rate (see bottom left of the Audacity window), and then play it in iTunes, does it still sound OK?
Yes, the newly created version (from Audacity) plays back without any of the noise in iTunes 11. This seems to be relegated purely to playback while in Audacity.
Do you drag the audio rightwards after importing it into Audacity, so that there is white space in the track before the audio waveform starts?
Do you have multiple files in one project window?
No. Only one file open at a time typically. Whoever, I did try having several files open at the same time to see if it had any perceptible affect, which it did not.
If you Tracks > Mix and Render the imported audio in Audacity, does that stop the crackle?
This does not seem to have any affect on the issue.
Exactly what device are you using for playback? Here we may have somethingTypically I use an Apogee Ensemble in the studio and a Duet 2 for playing live. Playback conditions (same file, different devices) are: Ensemble - crackling, Duet - Choppy / Stuttering playing (possibly the same as noted by others?), Built-In Audio - No noticeable problems. Both headphones and line outs were checked in all cases.What are your settings for that device in /Applications/Utilities/Audio MIDI Setup? Ensemble & Duet 2 = 44.1k, 24 bitWhat Audacity project rate do you usually use?I have only opened files so far, so Audacity’s defaults of 44.1k / 16 bit are all that I’ve tried.
Do you have Transport > Overdub (on/off) switched on (checked)? If so, does turning Overdub off help? This does not seem to affect the condition in either setting
Can you provide a link to an example file that crackles when you play it in Audacity? For example, you could upload it to dropbox, sendspace.com or similar. I’m not sure how to do this, as the issue is relegated to playback from inside Audacity. Exported / Saved files don’t contain any artifacts to listen to and I don’t know how to capture the output of my system… unless I set up a second computer to record the output of the first, which is going to have to be a project for another day.