protected function execute(InputInterface $input, OutputInterface $output) { $sampler = new LinuxSampler(); $output->writeln('Connecting to server...'); $sampler->connect(); $output->writeln('Sending MIDI NOTE_ON...'); $sampler->sendChannelMidiData(LinuxSampler::MIDI_MESSAGE_NOTE_ON, 0, 56, 112); $output->writeln('Waiting 2 seconds...'); sleep(2); $output->writeln('Sending MIDI NOTE_OFF...'); $sampler->sendChannelMidiData(LinuxSampler::MIDI_MESSAGE_NOTE_OFF, 0, 56, 112); }