diff --git a/src/emu/model_chan.h b/src/emu/model_chan.h
index ab955ac..a4fd1d0 100644
--- a/src/emu/model_chan.h
+++ b/src/emu/model_chan.h
@@ -11,6 +11,7 @@ struct model_chan_spec {
 	const char *prefix;
 	const char **ch_names;
 	const int *ch_stack;
+	const int *ch_dup;
 	const struct model_pvt_spec *pvt;
 	const int *track;
 };
diff --git a/src/emu/model_thread.c b/src/emu/model_thread.c
index 14c1f20..9f1df0c 100644
--- a/src/emu/model_thread.c
+++ b/src/emu/model_thread.c
@@ -20,6 +20,11 @@ init_chan(struct model_thread *th, const struct model_chan_spec *spec, int64_t g
 		const char *ch_name = spec->ch_names[i];
 		chan_init(c, type, fmt, prefix, gindex, ch_name);
 
+		if (spec->ch_dup != NULL) {
+			int dup = spec->ch_dup[i];
+			chan_prop_set(c, CHAN_DUPLICATES, dup);
+		}
+
 		if (bay_register(th->bay, c) != 0) {
 			err("bay_register failed");
 			return -1;