Apple Logic 7 User Manual Page 249

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AppendixBLogicControl—MIDIImplementation 249
Metering
Received:
D0,XX Peaklevel
<Hdr>,20,ii,mm,F7 Channelmetermode
<Hdr>,21,yy,F7 GlobalLCDmetermode
Transmitted: None
XX Meterlevelintheformof(0hhhllll):
hh Channeltobeaddressed(0thru7)
ll Meterlevel:
0thruC=levelmeter0%to100%
Overloadnotcleared!
E=setoverload
F=clearoverload
ii ChannelID(0to7)
mm modebitmapintheformof(00000lps):
l EnablelevelmeteronLCD
p Enablepeakholddisplay(horizontalonly)
s EnableSignalLED
yy 00=horizontal;01=vertical
Notes:
 Thereisonlyonelevelmeterperchannel.Forstereotracks,usethemaximumofleft
andrightlevels.
 Onlytransmitpeaklevels.LogicControlautomaticallydecreasesthelevelmeterbars,
andswitchesofftheSignalPresentLED(overtime).ThisapproachensuresthatMIDI
bandwidthtakesonlyafractionofthatrequiredbyimplementationswherethe
currentlevel(andpeaklevel)istransmittedconstantly.
 Decayrateisapproximately300mspermeterdivision(1.8secondstofallfrom100%
to0%).
 TheLCDmetervalueandthedurationoftheSignalPresentLEDarecontrolledbythe
samedatabyte.
 WhiletheLCDswitchesbetweenhorizontalandverticalmeteringmode,itignores
LCDmessages.YoushoulddelayLCDmessagesforatleast600msaftersendingan
LCDmeteringmodechangemessage.
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