Loopback Detection; Osc (Open Sound Control) - RME Audio MADIface USB User Manual

Examples for sending MIDI strings:
- Set input 1 to 0 dB: B0 66 68
- Set input 5 to maximum attenuation: B1 6A 0
- Set playback 1 to maximum: B4 66 7F
- Set Output 3 to 0 dB: B8 68 68
Note: Sending MIDI strings requires to use programmer's logic for the MIDI channel, starting
with 0 for channel 1 and ending with 15 for channel 16.
Further functions:
- Trim Gains On: BC 66 xx (BC = MIDI channel 13, xx = any value)
- Trim Gains Off: BC 66 xx or select a submix
Select submix (fader) in third row:
- channel 1/2: BC 68/69 xx
- channel 3/4: BC 6A/6B xx
etc.

24.6 Loopback Detection

The Mackie Control protocol requires feedback of the received commands, back to the hard-
ware controller. So usually TotalMix will be set up with both a MIDI input and MIDI output. Un-
fortunately any small error in wiring and setup will cause a MIDI feedback loop here, which then
completely blocks the computer (the CPU).
To prevent the computer from freezing, TotalMix sends a special MIDI note every 0.5 seconds
to its MIDI output. As soon as it detects this special note at the input, the MIDI functionality is
disabled. After fixing the loopback, check Enable MIDI Control under Options to reactivate the
TotalMix MIDI.

24.7 OSC (Open Sound Control)

Besides simple MIDI notes, the Mackie Protocol and Control Change commands, TotalMix FX
can also be controlled by the Open Sound Control, OSC. For details on setup and usage see
chapter 21.7.3.
An OSC implementation chart can be downloaded from the RME website:
http://www.rme-audio.de/download/osc_table_totalmix.zip
RME offers a free iPad template for the iOS app TouchOSC (by Hexler, available in the Apple
App-Store):
http://www.rme-audio.de/download/tosc_tm_ipad_template.zip
A template for Lemur is available from liine.net, the makers of Lemur.
The RME forum hosts further information, more templates (even for the iPhone) and lots of
useful user feedback.
User's Guide MADIface USB © RME
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