if I enter something larger than 3F as instrument and try to play it it crashes.

Here is the error message:

Unhandled exception. System.IndexOutOfRangeException: Index was outside the bounds of the array.
   at OxideTracker.Track.GetChannelState(Song song, Double patternTimeSeconds, Double songTimeSeconds, ChannelState& channelState, Int32& nextPatternIndex)
   at OxideTracker.MusicPlayer.GetBufferSample(Int32 bufferIndex, Double[][] channelBuffers, Vector2d[] mixedBuffer)
   at OxideTracker.MusicPlayer.GetBuffer(Byte[] buffer, Boolean padEndOfBuffer, Double volume, Double[][] channelBuffers, Vector2d[] mixedBuffer)
   at OxideTracker.MusicPlayer.SubmitBuffer()
   at System.Threading.Thread.StartCallback()
Aborted