i am on osx mbp2.8 late2008. i used a maxpatch to send a 3k raw midi/sysex file to a yamaha vl1m synth. this worked fine with any midiinterface sofar. not anymore with rme's ff400: checksum-err on the vl1 and a truncated file of 2k or less captured from vl1-out. normal midi and short sysex-commands seem to work.

the program sysex-librarian succeeds to send the same file. so i analysed the time-structure (chunks of 256b and pauses of 80ms) and made the maxprogram send exactly the same: still corrupted.

it seems there is a conflict of midiout and the rme-driver what sending of midi-packets concerns. or any other ideas?

i am on osx mbp2.8 late2008. i used a maxpatch to send a 3k raw midi/sysex file to a yamaha vl1m synth.  this worked fine with any midiinterface sofar. not anymore with rme's ff400: checksum-err on the vl1 and a truncated file of 2k or less captured from vl1-out. normal midi and short sysex-commands seem to work.

the program sysex-librarian succeeds to send the same file. so i analysed the time-structure (chunks of 256b and pauses of 80ms) and  made the maxprogram send exactly the same: still corrupted. 

raw-midi-midiout-ff400

as far as i had contact with the rme support they were very responsive and helpful. as most other midi interfaces don't cause trouble, as you say, i would recommend talking to the rme support first.

rme says its not reproducible in general - which i aggree in the case of using sysex-librarian. and they have no synth to test the particular case. 

i wonder if there could be a conflict between the max-midiout and the ff400 driver, e.g. regarding sending midi-packets. should be a legal question here. hoping to get input on other possible causes... best

rme says its not reproducible in general - which i aggree in the case of using sysex-librarian. and they have no synth to test the particular case. 
i wonder if there could be a conflict between the max-midiout and the ff400 driver, e.g. regarding sending midi-packets. should be a legal question here. hoping to get input on other possible causes... best


I don't have 400 but I'll try it on my 800

maybe it's related to the reported incompatibility between RME hardware & the agere firewire chipset present in the newest MBP ? (see RME forums for more details)

i use a fw-expresscard with ti-chipset. still, i wouldnt be surprised... best j.

raw midi, midiout, ff400