Every phrase deserves an answer. Drop a bar, get the fill — built entirely from the sounds of your own loop.
Or subscribe to The Vault and get it for only *$4.99
Formats: Standalone, VST3, AU, AAX (coming soon)
Authorization: Yurt Rock account login. No iLok or dongle required.
The free download builds and auditions every fill from your loop — export unlocks with a license or Vault membership. No card. No iLok.
AU & VST3 · AAX coming soon · macOS 12+ / Windows 10–11

Drop in any loop — or capture audio straight off a DAW track — and Dr. Fill reads its tempo, feel, and swing, then cuts it into its voices: kick, snare, hat, and everything else in there. The fill it writes back is built entirely from those sounds. Same kit, same room, same hands.

Enjoy total flexibility with the option to export the fills as MIDI files in addition to WAV files. We also provide mapping support for all major drum plug-ins including Superior Drummer, Addictive Drums 2, Slate Drums, BFD, General MIDI and more.

Two families of fills, 36 apiece, each played back in context as a two-bar phrase — your groove, then the answer. Drummer fills play like someone sat down behind the kit. Producer fills chop, stutter, and reverse it. Audition every one before you commit.

Browse and audition the full Yurt Rock catalog inside the plugin. Vault members write fills from any loop in it instantly — real session-drummer grooves from Nate Smith, Clyde Stubblefield, Marcus Finnie, Darren King, and more, every one of them an answer waiting to happen.

Producing at noon or at 3 AM? Dr. Fill ships with three distinct themes — Original, Aurora, and Cool Light — so every fill stays crisp and readable no matter what time of day you're creating. Pick the look that fits your studio and get back to the music.
One license, yours forever — or included with every Vault membership alongside Pick Pocket and the full catalog.
Or subscribe to The Vault and get it for only *$4.99
Formats: Standalone, VST3, AU, AAX (coming soon)
macOS: macOS 12 or later. Intel and Apple Silicon native (Universal 2).
Windows: Windows 10 or 11, 64-bit only.
CPU / RAM: Intel Core i5 / Apple M1 or equivalent. 4 GB RAM minimum, 8 GB recommended.
Disk space: 500 MB install, download only what you use
Authorization: Yurt Rock account login. No iLok or dongle required. Up to 3 activations.
Internet: Required for installation and activation only.
Tested in: Logic Pro, Ableton Live, Pro Tools, Cubase, Studio One, FL Studio, Reaper, Bitwig, GarageBand
Install it, drop in the track you're working on right now, and let Dr. Fill write the fill. If it earns its place in the mix, the license is one click away.
AU & VST3 · AAX coming soon · Works fully offline after activation