OP-1 Drum Utility

OP-1 Drum Utility is designed for creating Teenage Engineering Op-1DrumKit files (custom .AIF files) by merging together one-shot samples you have on your hard disk.

OP-1 Drum Utility application is actually a simple VST Host program, which connects to your default CoreAudio output (for previewing sounds) and looks for the OP-1 MIDI connection (optional, for previewing sounds from the MIDI keys on the OP-1).