# Class Sequencer.SyncMode

java.lang.Object
javax.sound.midi.Sequencer.SyncMode

Enclosing interface:
  `Sequencer`

public static class Sequencer.SyncMode extends Object
A `SyncMode` object represents one of the ways in which a MIDI sequencer's notion of time can be synchronized with a master or slave device. If the sequencer is being synchronized to a master, the sequencer revises its current time in response to messages from the master. If the sequencer has a slave, the sequencer similarly sends messages to control the slave's timing.

There are three predefined modes that specify possible masters for a sequencer: `INTERNAL_CLOCK`, `MIDI_SYNC`, and `MIDI_TIME_CODE`. The latter two work if the sequencer receives MIDI messages from another device. In these two modes, the sequencer's time gets reset based on system real-time timing clock messages or MIDI time code (MTC) messages, respectively. These two modes can also be used as slave modes, in which case the sequencer sends the corresponding types of MIDI messages to its receiver (whether or not the sequencer is also receiving them from a master). A fourth mode, `NO_SYNC`, is used to indicate that the sequencer should not control its receiver's timing.

See Also:
  - `Sequencer.setMasterSyncMode(SyncMode)`
  - `Sequencer.setSlaveSyncMode(SyncMode)`

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final Sequencer.SyncMode`
  `INTERNAL_CLOCK`
  A master synchronization mode that makes the sequencer get its timing information from its internal clock.
  `static final Sequencer.SyncMode`
  `MIDI_SYNC`
  A master or slave synchronization mode that specifies the use of MIDI clock messages.
  `static final Sequencer.SyncMode`
  `MIDI_TIME_CODE`
  A master or slave synchronization mode that specifies the use of MIDI Time Code.
  `static final Sequencer.SyncMode`
  `NO_SYNC`
  A slave synchronization mode indicating that no timing information should be sent to the receiver.

- ## Constructor Summary

  Constructors
  Modifier
  Constructor
  Description
  `protected`
  `SyncMode(String name)`
  Constructs a synchronization mode.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `final boolean`
  `equals(Object obj)`
  Indicates whether the specified object is equal to this synchronization mode, returning `true` if the objects are the same.
  `final int`
  `hashCode()`
  Returns a hash code value for this synchronization mode.
  `final String`
  `toString()`
  Returns mode's name as the string representation of the synchronization mode.

  ### Methods declared in class Object

  `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

- ## Field Details

  - ### INTERNAL_CLOCK

    public static final Sequencer.SyncMode INTERNAL_CLOCK
    A master synchronization mode that makes the sequencer get its timing information from its internal clock. This is not a legal slave sync mode.

  - ### MIDI_SYNC

    public static final Sequencer.SyncMode MIDI_SYNC
    A master or slave synchronization mode that specifies the use of MIDI clock messages. If this mode is used as the master sync mode, the sequencer gets its timing information from system real-time MIDI clock messages. This mode only applies as the master sync mode for sequencers that are also MIDI receivers. If this is the slave sync mode, the sequencer sends system real-time MIDI clock messages to its receiver. MIDI clock messages are sent at a rate of 24 per quarter note.

  - ### MIDI_TIME_CODE

    public static final Sequencer.SyncMode MIDI_TIME_CODE
    A master or slave synchronization mode that specifies the use of MIDI Time Code. If this mode is used as the master sync mode, the sequencer gets its timing information from MIDI Time Code messages. This mode only applies as the master sync mode to sequencers that are also MIDI receivers. If this mode is used as the slave sync mode, the sequencer sends MIDI Time Code messages to its receiver. (See the MIDI 1.0 Detailed Specification for a description of MIDI Time Code.)

  - ### NO_SYNC

    public static final Sequencer.SyncMode NO_SYNC
    A slave synchronization mode indicating that no timing information should be sent to the receiver. This is not a legal master sync mode.

- ## Constructor Details

  - ### SyncMode

    protected SyncMode(String name)
    Constructs a synchronization mode.
    Parameters:
      `name` - name of the synchronization mode

- ## Method Details

  - ### equals

    public final boolean equals(Object obj)
    Indicates whether the specified object is equal to this synchronization mode, returning `true` if the objects are the same.
    Overrides:
      `equals` in class `Object`
    Parameters:
      `obj` - the reference object with which to compare
    Returns:
      `true` if the specified object is equal to this synchronization mode; `false` otherwise
    See Also:
      - `Object.hashCode()`
      - `HashMap`

  - ### hashCode

    public final int hashCode()
    Returns a hash code value for this synchronization mode.
    Overrides:
      `hashCode` in class `Object`
    Returns:
      a hash code value for this synchronization mode
    See Also:
      - `Object.equals(java.lang.Object)`
      - `System.identityHashCode(Object)`

  - ### toString

    public final String toString()
    Returns mode's name as the string representation of the synchronization mode.
    Overrides:
      `toString` in class `Object`
    Returns:
      a string representation of the synchronization mode