The sequence recording part of MidiSampleScene.cs

MidiSampleScene_record_sequence.cs

                    if (GUILayout.Button("Start recording SMF") && isSequencerOpened)
                    {
                        var transmitters = new HashSet<ITransmitter>();
                        if (selectedInputDeviceId != null)
                        {
                            var transmitter = MidiSystem.GetTransmitter(selectedOutputDeviceId);
                            if (transmitter != null)
                            {
                                transmitters.Add(transmitter);
                            }
                        }
                        sequencer.UpdateDeviceConnections(new HashSet<IReceiver>(), transmitters);

                        sequencer.SetSequence(new Sequence(Sequence.Ppq, 480));
                        if (sequencer.GetIsRecording())
                        {
                            sequencer.StopRecording();
                        }
                        sequencer.StartRecording();
                    }

                    var recordedSmfPath = Path.Combine(Application.persistentDataPath, "record.mid");
                    if (GUILayout.Button("Stop recording") && isSequencerOpened)
                    {
                        sequencer.Stop();

                        var sequence = sequencer.GetSequence();
                        if (sequence.GetTickLength() > 0)
                        {
                            using (var stream = new FileStream(recordedSmfPath, FileMode.Create, FileAccess.Write))
                            {
                                MidiSystem.WriteSequence(sequence, stream);
                            }
                        }
                    }

                    if (File.Exists(recordedSmfPath) && GUILayout.Button("Play recorded SMF") && isSequencerOpened)
                    {
                        using (var stream = new FileStream(recordedSmfPath, FileMode.Open, FileAccess.Read))
                        {
                            UpdateReceiverConnections();

                            sequencer.Stop();
                            sequencer.SetSequence(stream);
                            sequencer.Start();
                        }
                    }