| o | Kulitta.ChordSpaces.OPTIC, Kulitta.ChordSpaces, Kulitta |
| Oboe | Kulitta.EuterpeaSpecial |
| Ocarina | Kulitta.EuterpeaSpecial |
| Octave | Kulitta.EuterpeaSpecial |
| octStacks | Kulitta.ChordSpaces.OPTIC, Kulitta.ChordSpaces, Kulitta |
| oEq | Kulitta.ChordSpaces.OPTIC, Kulitta.ChordSpaces, Kulitta |
| offset | Kulitta.EuterpeaSpecial |
| okParse | Kulitta.Learning.Parser |
| onset | Kulitta.Grammars.MusicGrammars |
| opcEq | Kulitta.ChordSpaces.OPTIC, Kulitta.ChordSpaces, Kulitta |
| OpenCuica | Kulitta.EuterpeaSpecial |
| opened | Kulitta.EuterpeaSpecial |
| OpenHiConga | Kulitta.EuterpeaSpecial |
| OpenHiHat | Kulitta.EuterpeaSpecial |
| OpenTriangle | Kulitta.EuterpeaSpecial |
| opEq | Kulitta.ChordSpaces.OPTIC, Kulitta.ChordSpaces, Kulitta |
| optcEq | Kulitta.ChordSpaces.OPTIC, Kulitta.ChordSpaces, Kulitta |
| optComp | Kulitta.ChordSpaces.OPTIC, Kulitta.ChordSpaces, Kulitta |
| optEq | Kulitta.ChordSpaces.OPTIC, Kulitta.ChordSpaces, Kulitta |
| optEq' | Kulitta.ChordSpaces.OPTIC, Kulitta.ChordSpaces, Kulitta |
| OrchestraHit | Kulitta.EuterpeaSpecial |
| OrchestralHarp | Kulitta.EuterpeaSpecial |
| Orn | Kulitta.EuterpeaSpecial |
| Ornament | Kulitta.EuterpeaSpecial |
| osc | Kulitta.EuterpeaSpecial |
| oscDur | Kulitta.EuterpeaSpecial |
| oscDurI | Kulitta.EuterpeaSpecial |
| oscFixed | Kulitta.EuterpeaSpecial |
| oscI | Kulitta.EuterpeaSpecial |
| oscPartials | Kulitta.EuterpeaSpecial |
| otEq | Kulitta.ChordSpaces.OPTIC, Kulitta.ChordSpaces, Kulitta |
| outA | Kulitta.EuterpeaSpecial |
| outFile | Kulitta.EuterpeaSpecial |
| outFileNorm | Kulitta.EuterpeaSpecial |
| outNamePre | Kulitta.Learning.Learning |
| output | Kulitta.EuterpeaSpecial |
| OutputDeviceID | Kulitta.EuterpeaSpecial |
| OverdrivenGuitar | Kulitta.EuterpeaSpecial |