FULLPIPE: Implement FullpipeEngine::toggleMute()
FULLPIPE: Implement FullpipeEngine::updateSoundVolume()
FULLPIPE: Implement FullpipeEngine::processArcade()
FULLPIPE: Implement FullpipeEngine::playTrack()
FULLPIPE: Proper implementation of FullpipeEngine::startSceneTrack()
FULLPIPE: Implement FullpipeEngine::getSceneTrack()
FULLPIPE: Remove redundant object casts
FULLPIPE: Implement FullpipeEngine::setSceneMusicParameters()
FULLPIPE: Proper implementation of FullpipeEngine::playSound()