I uploaded two MP3 files to Audacity 2.1.1, edited and connected them (at the 49sec point) to one file. Audio sounds perfect when played in Audacity, but once exported to a .AIFF-C audio file, static starts at 1min50sec. Audio file length 25min30sec.
Does anyone know how to fix it?
Using it to mediate and I can’t connect clearly with Source until it’s fixed 
Using Mac OS X v10.9.5
Audacity 2.1.1 (downloaded 11/2/15)
LAME Library v3.98.2 for Audacity on OSX
Audacity does not export as compressed AIFF unless you chose Custom FFmpeg Export when you exported. Is that what you did?
In what app are you playing the exported file, using exactly what playback device?
If you import the exported file back into Audacity, does it crackle?
Gale
Restart Audacity and import the final edit AIFF file. Turn on View > Show Clipping. Do you get a forest of thin red lines on the right? Those are clipping sound damage.
This is where it gets messy. If you Saved an Audacity Project, you could open up the project to the original two files on the timeline, reduce the volume slightly and export a new, clean AIFF file. If you don’t have the Project, you will probably need to edit the work again. Once you have clipping or other damage in an Export, it’s pretty much burned in.
Audacity has a very high tolerance for damage on the timeline. That allows you to apply filters and effects without trashing your show. But the instant you Export the work, you leave the Audacity protection.
Your damage could be something else entirely, but that’s what it probably is.
Let us know.
Ommmmmmmmmmmmmmmmmmmmm,
Koz
Gale - Yes, I exported it as custom. I’ve played the final file on QuickPlayer, ITunes and DropBox and it all sounds the same - with static. And yes, if I import back, the file has static.
Koz- My file in Audacity looks like it’s been massacred, it’s flooded with red clippings all throughout the timeline (pic attached). The file has various high pitch tones, which may be contributing to it. I’m going to start from scratch. Is turning the volume down the only way to prevent this?
Thanks~CT
Is turning the volume down the only way to prevent this?
Yup.
As above, when you’re under the protective umbrella of Audacity, that’s not serious damage, but the instant you leave, the damage becomes apparent and it’s permanent.
It may not take much volume reduction to solve it. Leave Show Clipping on while you’re editing. Drag-select the problem segment and Effect > Normalize to -1. Don’t click anything else.
I’d be surprised if you could hear the difference other than not clipping any more. The fix may be that simple.
Koz
It worked! Thank you… and Namaste.
Exporting to a compressed format wouldn’t help if you were “just over” the 0 dB limit before you exported.
Gale