MIKE ROSS wrote in a message to Roy J. Tellason:

MR>  For example some MIDI OUT's/THRU's mix the local data with
MR> the received data so that there are processing delays involved.

RJT> Thru isn't supposed to do that.

MR> Sure, a master keyboard may have such a feature. I know for certain
MR> the Roland MKB-300 keyboard controller merges the input stream with
MR> its own. 

On the _thru_ output?  Leave it to Roland to do something weird like that...

How recent is that unit?  I have a bunch of their service literature,  but
nothing particularly recent,  nothing newer than 10-12 years now.

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