On Monday, 23 April 2007 12:37, Vince Negri wrote:
> "is there a risk that (when using RG
> in conjuction with
> an external recorder) RG always goes into record mode when you record
> on the external
> recorder? You want start/stop/position to be in lockstep
> but not necessarily all-or-nothing record. (That is, it makes perfect
> sense for the external recorder to be recording live instruments while
> RG is merely playing along in sync, not recording.)"
Your point is a legitimate one. We need to address this scenario, and I think
that we centainly can. With a bit of work. We needed to extend the current
implementation, adding support for the MMC channel (or ID) mechanism. See
references 1, 2 and 3.
Every device sending/responding to MIDI Machine Control messages may have an
unique ID number in the MIDI network. The MMC slaves only recognize the MMC
commands matching their own ID, or equal to the broadcast ID (0x7f). It is
possible to have two (or more) devices set to the same ID number. What this
means is that both devices always respond to the same MIDI Machine Control
messages with that ID number. There is no limit as to how many individual ID
numbers a given device can respond to (there are 126 channels).
We need to include in Rosegarden a configuration option to allow the user to
specify an ID for send and receive MMC commands. To give complete
flexibility, we should allow for each master MMC command a different ID,
including the option to send the bradcast ID. Idem for receiving commands:
allow the user to specify a different ID for each command, with the option to
recognize or not the broadcast ID. To summarise:
Master Slave
MMC Command common id=?? common id=??
------------------------------+-------------+------------------+
0x01 Stop id=?? id=?? / bcast[y/n]
0x02 Play id=?? id=?? / bcast[y/n]
0x03 Deferred Play id=?? id=?? / bcast[y/n]
0x04 Fast Forward id=?? id=?? / bcast[y/n]
0x05 Rewind id=?? id=?? / bcast[y/n]
0x06 Record Strobe (Punch In) id=?? id=?? / bcast[y/n]
0x07 Record Exit (Punch out) id=?? id=?? / bcast[y/n]
0x09 Pause id=?? id=?? / bcast[y/n]
References
[1] http://www.borg.com/~jglatt/tech/mmc.htm
[2] http://en.wikipedia.org/wiki/MIDI_Machine_Control
[3] http://www.midi.org/about-midi/specshome.shtml
Regards,
Pedro
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