if ever somebody is interested i made a few changes to the great particle chamber of derek holzer (i hope he won't mind) in order to create as many as you wish (i compacted a little bit the interface in order to fit in my screen) and eventually build another interface on top of it. the third outlet is the object number (i added a small example of external control).
#N canvas 69 333 842 185 10; #X obj 4 13 particlechamber; #X obj 5 73 +~; #X obj 88 74 +~; #X obj 5 108 vols~; #X obj 322 27 vsl 15 78 0 100 0 0 empty empty Volume 0 -8 0 8 -233017 -1 -1 7600 1; #X obj 6 147 dac~; #X obj 150 116 tgl 15 0 empty empty empty 0 -6 0 8 -195568 -1 -1 1 1; #X floatatom 150 155 5 0 0 0 - - -; #X floatatom 195 151 5 0 0 0 - - -; #X obj 5 91 +~; #X obj 88 91 +~; #X floatatom 89 35 5 0 0 0 - - -; #X floatatom 184 33 5 0 0 0 - - -; #X floatatom 279 32 5 0 0 0 - - -; #X obj 150 134 dsp; #X obj 89 51 s obj1Ref; #X obj 408 4 cnv 15 160 170 empty empty remote_control_example 3 10 0 8 -257838 -4 0; #X obj 450 45 r obj1Ref; #X obj 450 139 forward; #X obj 422 46 vsl 18 90 -100 20 0 0 empty empty empty 5 12 0 12 -229056 -1 -1 5800 1; #X obj 583 4 cnv 15 245 170 empty empty another_remote_control_example 3 10 0 8 -257838 -4 0; #X obj 625 45 r obj1Ref; #X obj 597 46 vsl 18 90 -100 20 0 0 1001_gran_gain gain1_rec empty 5 12 0 12 -229056 -1 -1 0 1; #X msg 450 70 send $1_gran_gain; #X msg 625 87 ; gain1_rec send $1_gran_gain; #X obj 99 13 particlechamber; #X obj 194 13 particlechamber; #X connect 0 0 1 0; #X connect 0 1 2 0; #X connect 0 2 11 0; #X connect 1 0 9 0; #X connect 2 0 10 0; #X connect 3 0 5 0; #X connect 3 1 5 1; #X connect 4 0 3 2; #X connect 6 0 14 0; #X connect 9 0 3 0; #X connect 10 0 3 1; #X connect 11 0 15 0; #X connect 14 0 7 0; #X connect 14 1 8 0; #X connect 17 0 23 0; #X connect 19 0 18 0; #X connect 21 0 24 0; #X connect 23 0 18 0; #X connect 25 0 1 1; #X connect 25 1 2 1; #X connect 25 2 12 0; #X connect 26 0 9 1; #X connect 26 1 10 1; #X connect 26 2 13 0;