Problem with Hardware on Midi sync on Loop mode

[Alexia]

Im not that great in Midi but this is quite a big problem in my work flow and i cant seem to figure out. ):

Im running Pro tools 8 latest version (HD) with a motu midi interface
and tons of hardware , all my hardware is syncing fine exept my Roland 808 and a Step sequencer from the 90s.

When im on "loop playback" the 808 stops at the end of the firts loop and doesnt keep looping , no matter how short or long loop is , the 808 will stop after the firts loop.

The Step sequencer gets blocked after the 1st loop as well , it keeps playing but i cant write any note on it .. sometimes it stops randomly and then continues.

Both dont have this problem if im not in Loop Playback , but this is a big problem for me as I am working on dance music.!

please help , Live and Logic are looping this machines fine.
.I have gone trough all midi boxes and havent achieve any progress or clue..
is there any message Pro tools might be sending to these machines ?
thanks
A

[alx002]

Hi Alexia

Digidesign knows already this F.... problem since 4 years........ Nothing has evolved since 4 years........

The fact is that Protools use a bad MBC procedure in Loop playback mode ( They add this feature after Version 6.4 ).

WHen PT is in loopplayback a lot of HArdware Drum computer or sequencer ( synched to PT)STOPS at the point of loop !!!!