: Source (s, DataType::MIDI, name)
, MidiSource (s, name, flags)
, PlaylistSource (s, orig, name, p, DataType::MIDI, begin, len, flags)
: Source (s, DataType::MIDI, name)
, MidiSource (s, name, flags)
, PlaylistSource (s, orig, name, p, DataType::MIDI, begin, len, flags)