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27.5 Simple MIDI Control<br />
The stereo output faders (lowest row) which are set up as Monitor Main outputs in the Monitor<br />
panel can also be controlled by the standard Control Change Volume via MIDI channel 1.<br />
With this, the main volume of the <strong>HDSP</strong> <strong>AES</strong>-<strong>32</strong> is controlable from nearly any MIDI equipped<br />
hardware device.<br />
Even if you don't want to control all faders and pans, some buttons are highly desired to be<br />
available in 'hardware'. These are mainly the Talkback and the Dim button, and the new monitoring<br />
options (listen to Phones submixes). Fortunately a Mackie Control compatible controller is<br />
not required to control these buttons, as they are steered by simple Note On/Off commands on<br />
MIDI channel 1.<br />
The notes are (hex / decimal / keys):<br />
Monitor Main: 3E / 62 / D 3<br />
Dim: 5D / 93 / A 5<br />
Mono: 2A / 42 / #F 1<br />
Talkback: 5E / 94 / #A 5<br />
Monitor Phones 1: 3F / 63 / #D 3<br />
Monitor Phones 2: 40 / 64 / E 3<br />
Monitor Phones 3: 41 / 65 / F 3<br />
Preset 1: 36 / 54 / #F 2<br />
Preset 2: 37 / 55 / G 2<br />
Preset 3: 38 / 56 / #G 2<br />
Preset 4: 39 / 57 / A 2<br />
Preset 5: 3A / 58 / #A 2<br />
Preset 6: 3B / 59 / B 2<br />
Preset 7: 3C / 60 / C 3<br />
Preset 8: 3D / 61 / #C 3<br />
An example of a small MIDI controller covering such MIDI functionality (and even some more) is<br />
the Behringer BCN44. This little box has 4 pots and 8 buttons for all the above functions – for<br />
less than 60 Euros.<br />
27.6 Loopback Detection<br />
The Mackie Control protocol requires feedback of the received commands, back to the hardware<br />
controller. So usually TotalMix will be set up with both a MIDI input and MIDI output. Unfortunately<br />
any small error in wiring and setup will cause a MIDI feedback loop here, which then<br />
completely blocks the computer (the CPU).<br />
To prevent the computer from freezing, TotalMix sends a special MIDI note every 0.5 seconds<br />
to its MIDI output. As soon as it detects this special note at the input, the MIDI functionality is<br />
disabled. After fixing the loopback, check Enable MIDI Control under Options to reactivate the<br />
TotalMix MIDI.<br />
<strong>User's</strong> <strong>Guide</strong> <strong>HDSP</strong> <strong>AES</strong>-<strong>32</strong> © <strong>RME</strong> 65
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