I’m using one OT as main sequencer, also i have some other synths sequenced with the OT.

The key here to avoid feedback is to use two MIDI tracks in Live, one for monitoring, and other for note send.

For example:

The monitoring track will be something like this:

Midi Track - Input from OT, Output None.
This track has MONITORING ON
For the OT you will need one monitoring track for each MIDI track you use. Then you have so select this track from push to see it’s content feedback while playing.

The send track

Midi Track - Input from Push, Output OT to the Auto Channel.
Monitoring is set to auto and you ARM this track manually prior to rec.
Then you select the track you wanna rec on the OT and the Auto channel does the rest.

II think you can add the MD to the equation.

Does the MD use several MIDI channels? how many? Does the MD has Auto CHannel also?