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What is AU?

Sun AU is the native audio format for Sun Microsystems workstations, using simple mu-law encoding or uncompressed PCM.

What is XM?

Extended Module (XM) is the native format of Fast Tracker II, supporting samples, patterns, effects, and volume envelopes.

When Should You Use AU vs XM?

Use AU When...

AU is built for legacy unix audio, sun workstation sound. Think of it as the perfectionist — every pixel, every sample, preserved exactly as intended.

Use XM When...

Reach for XM when your priority is tracker music, demoscene, retro game audio — its uncompromising quality ensures every detail is preserved.

AU vs XM: Key Differences

  • •The core technical difference: AU relies on lossless compression whereas XM uses lossless compression.
  • •Since both AU and XM use lossless compression, the quality characteristics are comparable — differences in file size come down to how efficiently each format implements compression.
  • •Alpha channel support: XM lacks transparency support.
  • •File sizes: AU files typically range Small to medium, similar to WAV and XM files Moderate, depends on sample content.
  • •Primary audience: AU is built for legacy unix audio, sun workstation sound scenarios, while XM focuses on tracker music, demoscene, retro game audio — pick the format that matches your output requirement.

Advantages of AU

  • ✓The lossless nature of AU means file sizes stay reasonable while handling Legacy Unix audio, Sun workstation sound efficiently.
  • ✓From mobile devices to enterprise servers, AU is recognized and supported everywhere.
  • ✓The trade-off for AU's perfection is larger files — but for archival work, it is worth every megabyte.
  • ✓AU is a first-class citizen in all major software ecosystems, from creative suites to development environments.

Advantages of XM

  • ✓XM compresses data using lossless methods, keeping file sizes manageable for Tracker music, demoscene, retro game audio.
  • ✓Industry-wide support means XM files open anywhere — from legacy systems to the latest devices.
  • ✓Lossless quality makes XM the gold standard for archival and master copies.
  • ✓From professional software to open-source alternatives, XM works out of the box.

Common Use Cases for AU to XM Conversion

  • Voice recordings
  • Streaming services
  • Audio books
  • Sound design
  • Language learning
  • Professional broadcasting

Industry Applications

BroadcastingAudio EngineeringLanguage LearningAccessibilityVoice-overAudio Archiving

Best Practices for AU to XM Conversion

  • →For AU to XM: match the sample rate and bit depth to your delivery platform — 44.1 kHz / 16-bit is the standard for music
  • →Apply loudness normalization (LUFS) before conversion to ensure consistent volume across your audio library
  • →XM prioritizes quality — ensure your storage can accommodate the resulting file sizes
  • →Check that metadata tags (artist, album, track number) survive the conversion
  • →Convert a short segment first to verify quality at your chosen bitrate
  • →Keep a lossless master copy in case you need to re-encode for a different platform

Related Article

Video Compression Guide: Reduce File Size Without Losing Quality

Learn more about AU and XM formats in our detailed guide.

Troubleshooting AU to XM Conversion

  • !XM audio quality degraded vs AU → use a higher bitrate (at least 256 kbps for music)
  • !XM file won't play on your device → check format compatibility with your player or platform
  • !Metadata (artist, album, title) lost after AU to XM conversion → some formats like XM may not support ID3 tags
  • !Volume changed after converting AU to XM → normalize audio levels before conversion for consistent playback

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About AU and XM

AU

AU (AU audio) - Sun AU, legacy Unix audio format for Sun workstations. Best for legacy unix audio, sun workstation sound.

XM

XM (XM modules) - Extended Module, Fast Tracker II music module format. Ideal for tracker music, demoscene, retro game audio.

Format Comparison

CompressionLossless → Lossless
TransparencySupported
Use CaseConvert from legacy unix audio, sun workstation sound to tracker music, demoscene, retro game audio
File Size~Moderate, depends on sample content after conversion

FAQs

Is converting AU to XM free?

Yes, GoConvertFile offers free conversion of AU to XM for files up to 100MB. No registration required.

How long does it take to convert AU to XM?

Most AU to XM conversions complete within seconds for standard-sized files. Larger files may take longer depending on the conversion complexity.

What is XM best used for?

XM is ideal for tracker music, demoscene, retro game audio. Extended Module, Fast Tracker II music module format

What file size should I expect after converting AU to XM?

File size after AU to XM conversion depends on the content complexity and quality settings. Both formats use similar compression approaches so sizes are comparable.

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