Which Midi Comand?, Which MIDI comand to change instrument? Options

[nardao]

Hi Everybody ,I use digital perfomer with my MIDI music in my studio but I now intend to play live using an old sequencer that I bought as a bargain but I have found a big problem to solve,Imagine the folowing scenario :

I have an Alesis QS8 , a Roland JV880, Roland SC880 on my midi setup and when working on computer everything is ok , but on a hardware sequencer is not that easy the problem is which MIDI COMAND I have to use in my external sequencer to tell that a specific MIDI track should play a patche on JV880 and another track should play SC880 . I know it is so simple but I can not remender how to do this. Anyone on earth could help me ? Is it a control change ? or sysex??

Cheers to all of you.

I will be waiting for this help.

THANKS A LOT.