XLN Audio XO 1.8.10 — macOS

Drum programmers and beat makers who manage large sample libraries will find a practical tool in XLN Audio XO. It sits on a track or bus in your host, acting as both a sample browser and a drum machine. The plugin sorts one-shot drum sounds by similarity, so you can find the right kick or snare without digging through folders. The XO Space visual interface displays similar sounds together, making selection faster.

Where XO fits in a session

• Track instrument — Load XO on a MIDI track and trigger sounds from its built-in sequencer or your host's piano roll.
• Sample browser — Drag and drop sounds from XO onto audio tracks in your host. Hot Swap lets you quickly replace a sound while the pattern keeps playing.
• Beat sketchpad — Use the built-in sequencer with Groove Templates to build patterns. The 240+ editable beat presets give you starting points.
• Standalone mode — XO can run outside the host for browsing and organizing samples before you commit to a session.

What comes in the box

XO ships with over 8,700 one-shot samples and 240 editable beat presets. Playground mode lets you audition sounds in a more exploratory way. The plugin supports VST, AU, and AAX formats on both Intel and Apple Silicon Macs running macOS 10.13 or later.

Plugin not showing up? Check your folder paths

XO is generally straightforward, but a few things trip people up. If the plugin doesn't appear in your host after installation, check that you placed the AU, VST, or AAX file in the correct folder for your DAW. Some hosts need a manual rescan of plugin directories. A rare slow start-up was addressed in version 1.8.10, so if you're on an older build, updating can help.

Another frequent issue: dragging audio from XO to a track produces silence or the wrong sound. This usually happens when the host's drag-and-drop target isn't an audio track — make sure you're dropping onto an audio lane, not a MIDI lane. If the exported MIDI pattern sounds off, check that muted lanes aren't being exported; version 1.8.10 fixed a bug where muted lanes were included in MIDI export. Audio export while the host is playing was also fixed in that release.

The XO Space visual interface can feel crowded when you first open a large preset. Try narrowing the field by filtering sample types — kicks, snares, hi-hats — before browsing. That cuts down the display to what you actually need.

How XO compares with similar Mac apps

There are a few other tools for drum sample browsing and beat making on macOS. Here's how XO stacks up against them.

You load samples into cells and assign them to keys. XO works differently — it organizes samples by similarity rather than folder structure. If you often spend time auditioning dozens of snares to find the right one, XO's visual browsing can be faster.

XLN Audio XO versus Ableton Live's Drum Rack: Drum Rack is part of Live, so it's not a standalone plugin. It works well if you're already in Ableton, but it doesn't offer the same sample-by-similarity browsing or the XO Space interface. XO works in any host and includes standalone mode, which Drum Rack can't do. For producers who move between DAWs, XO is more portable.

XLN Audio XO versus Atlas by Algonaut: Atlas is a sample browser that uses AI to organize sounds by similarity, similar to XO's approach. But Atlas is purely a browser — it doesn't have a sequencer, beat presets, or Accentuator. XO combines browsing with pattern creation, so you can audition samples and build a beat in one place. Atlas is better if you only need to manage a large sample library. XO is better if you want to go from browsing to a finished pattern without switching tools.

Don't start from scratch: use XO's 240+ beat presets

The most common one: treating XO like a standard drum machine and trying to program every hit from scratch. XO's 240+ beat presets are there to save time. Drag one in, then swap individual sounds using Hot Swap. That's faster than building a pattern from empty pads.

Another mistake is ignoring the Accentuator. It adjusts velocity and timing to make patterns feel less robotic. Beginners often leave it off, then wonder why their beats sound stiff. Even a small amount of Accentuator adds life.

A third error: not using Groove Templates. These are preset swing and shuffle feels that you can apply to any pattern. New users sometimes spend time manually dragging MIDI notes to create a human feel when a Groove Template does it in one click.

Finally, some people load XO, find a sound they like, and never explore the XO Space. The whole point of the interface is to show you similar sounds you might not have considered. Clicking around in XO Space often leads to better combinations than the first kick or snare you grab.

• macOS 10.13 or later
• Intel or Apple Silicon
• VST, AU, or AAX host