Not all USB midi interfaces support midi time stamping.įrom what i understand the only multi port USB interfaces to support midi time stamping under OSX are the Motu ones. If they did, then the timing of the synth on port 5 would not increase as more tracks are added. This proves that old Emagic USB interfaces do not support time stamping under OSX. Infact the other synths timing would cascade as you went along from midi ports 1 to 5. I repeated the test with 5 tracks going, and once again the synth on port 5 was late. Checking its recorded audio, it was now more or less bang on the grid. I then soloed midi tracks 1 to 4, and recorded synth 5 to audio. The synth on port 5 was around 6-8 ms off the grid. I then recorded the synths outputs as audio, and checked the sample editor for timing jitter etc. I loaded 5 midi tracks in Logic, sending to 5 ports on my Unitor8 Mk2 and 5 midi synths.
MOTU MIDI TIMEPIECE AV GEARSLUTZ SOFTWARE
Even though they give similar results, they are two different protocols.įrom various sources i've learned that even if the host software supports OSX timestamping, if the interface does not, then you have no benefit from the timing improvements. Now then, as the Emagic Unitor 8 and AMT8 both come out BEFORE OSX, how could they support a feature native to OSX? Remember they do support AMT, but not MTS. However MTS under OSX will only work if BOTH the software and hardware support it. And so many people guessed that their old Emagic units still supported a version of the old AMT, now known as OSX midi time stamping. However when OSX came out, Emagic Logic dropped support of AMT as time stamping was native within OSX. They developed the Emagic Unitor8 and AMT8 interfaces to support this protocol, and it worked really well.
MOTU MIDI TIMEPIECE AV GEARSLUTZ MAC
Under Mac OS9, this technology was known as AMT (active midi transmission) and was an Emagic protocol. This is where midi data is sent from the host software in packets to the USB interface, and there it is buffered and sent to all the multiple midi out ports simultaneously. It's been long speculated that old Emagic Unitor8/AMT USB midi interfaces still support midi timestamping.
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