Re: MCU Pro and X2/X3 Users - LCD Level Metering?
2013/12/03 23:08:24
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Dave,
Thanks loads for checking this out for me. On the Mackie d8b the meter bridge has 24 LED segments arranged vertically, it looks just like the original HUI. Apparently, Mackie decided to gang together pairs of LED segments so you'll never see them change by less than two at a time, so effectively it's a 12 segment LED ladder, two LEDs per segment. It sounds like the MCU Pro divided that resolution by 2 again for effectively a 6 segment (horizontal or vertical?) level meter.
The Mackie Control Protocol (MCP) sends across a 0xD0 meter level MIDI message for each active meter on change within a range of 0x0 to 0xC, so that's zero plus 12 additional levels. The BluAudio D8Bridge software is grabbing the inbound MCP 0xD0 MIDI messages and is translating them into native d8b serial instructions for illuminating the d8b LED meters, except that the scaling is different than what the DAW meters show; on the d8b/D8Bridge/MCP implementation the meters show a bit hotter than what the DAW shows. There are similar metering reports for Presonus StudioOne and D8Bridge. The D8Bridge developer was under the impression that the only thing the MCU Pro did with incoming 0xD0 level information was to light up the signal activity/present LED on the track strip, so this really helps clarify.
Anyways, this info about how the MCU Pro handles the incoming 0xD0 messages will be helpful in troubleshooting this design issue and may help with a future D8Bridge calibration function to essentially divide the meter levels by some calibration divisor to get the d8b meters to match the DAW meters.
Again, very grateful for your feedback. Best regards.
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