9 - Machine Control—Notes on individual devices9–9Faders) allow the PODs and MASTER layer fadersrespectively to send MIDI Control Change messagesto MIDI devices connected to the TM-D4000.9.4.6 JLC BB3The J. L. Cooper BB3 transport controller can beconnected to the MIDI IN of the TM-D4000 andused to duplicate the transport keys of the console(i.e. pressing the keys of the BB3 will control theexternal unit currently selected for transport controlin the Machine Control List). As well as MMC com-mands, the BB3 also transmits MIDI Note On andNote Off information for notes 21 through 25 onchannel 16 (fixed).To avoid confusion, therefore, the TM-D4000 willnot map these notes on channel 16 to the transportkeys, unless the BB3 is added to the list of externaldevices from the Supported Devices list.9.4.7 MMC devicesThere are two MMC control methods: the first beinga closed-loop (MMC closed) where the con-trolled device is sending information back from itselfusing the MIDI connections, providing an informa-tion feedback cycle. Connections should be madefrom the MIDI OUT of the TM-D4000 to the MIDIIN of the controlled unit, and from the MIDI OUTof the controlled unit to the MIDI IN of the TM-D4000, allowing two-way communication.The second is an open system (MMC open),which is closer to a “command and forget” system.No feedback is provided from the controlled device,and the connection is a one-way connection; from theMIDI OUT of the TM-D4000 to the MIDI IN of thecontrolled unit.9.4.8 Cascade slaveThis allows control of a slave cascade unit’s transportkeys from a master cascade unit. For details of thisfacility, see 11, “Cascade”.Any unit which is connected for transport control to acascade slave will then behave as if the slave’s owntransport keys have been pressed to control it.
