Ok,i've just mailed to you, but i did'n't really understood what you mean...
i'm afraid there's no solution for this problem: as slave this (stupid) TechnoDroid plays everything! the only way: set your other machines's Midi out,( in Cake6 for instance)on MIDI channels 9,11,12 to 16,only, and i'm not really sure it'll solve the problem...you cannot control the received channel in the mc303...gasp!
The "best" you have to do is to configure the mc303 as the master for all the gear...not very funny...( "she" was driving my jx305,electribe a and r,a i40M,...
good luck
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bLaCk LeMoN