Originally Posted by thedreaming
The zune (at least the 30gb version) can't handle anything about 196 kbps and the native format is wma, but it can obviously play mp3, but if your amazon 256 kbps on your zune have been converted down to 196 kbps, but on your computer they are still 256 kbps.
WMA Lossless is handle by all zune devices
320 kbps MP3s (available DRM-free in marketplace) playback fine on all Zune devices
Lossy WMA should not add any trouble to a Zune device.
Your 256 kbps songs from Amazon are converted because your Conversion Settings are wrongly set. Go to Settings - Device - Conversion Settings and change audio to "only convert formats not supported by Zune"