[maxmsp] Turning on reverb for GM synth

I just read in the 'Max Topics' manual pdf (for max 4.6) that reverb ca be turned on for the DLS general midi synth.

It states that i should use the following message to turn reverb on:

;# SM driver reverb 1/0 <portname>

but it doesnt say what i should send that message to?

Also, im assuming that portname is AU DLS Synth 1?

Anyone know how to do this?

Thanks!