Added - global constant XSAMPA in `isis_constants` which contains all supported phonemes
0.3.0
Changed - allow endless nested sequential events (if no simultaneous events occur in between)
0.2.0
Changed - applied movement from music related parameter and converter modules (which have been moved from [mutwo core](https://github.com/mutwo-org/mutwo) in version 0.49.0 to [mutwo.ext-music](https://github.com/mutwo-org/mutwo.ext-music))