Index: s_audio_jack.c
===================================================================
--- s_audio_jack.c	(Revision 9698)
+++ s_audio_jack.c	(Arbeitskopie)
@@ -13,7 +13,7 @@
 
 
 #define MAX_CLIENTS 100
-#define NUM_JACK_PORTS 32
+#define NUM_JACK_PORTS 1024
 #define BUF_JACK 4096
 static jack_nframes_t jack_out_max;
 #define JACK_OUT_MAX  64
@@ -100,8 +100,9 @@
 static void
 jack_shutdown (void *arg)
 {
-        /* Ignore for now */
-  //    exit (1);
+  fprintf(stderr, "jack: JACK server shut down\n");
+  sys_close_audio();
+  jack_client = NULL;
 }
 
 static int jack_xrun(void* arg) {
@@ -228,6 +229,7 @@
         int client_iterator = 0;
         int new_jack = 0;
         int srate;
+        jack_status_t status;
 
         jack_dio_error = 0;
         
@@ -243,13 +245,28 @@
                 inchans = NUM_JACK_PORTS;
         }
 
-        /* try to become a client of the JACK server (we allow two pd's)*/
+        /* try to become a client of the JACK server */
+        /* if no JACK server exists, start a default one (jack_client_open() does that for us... */
         if (!jack_client) {
           do {
             sprintf(port_name,"pure_data_%d",client_iterator);
             client_iterator++;
-          } while (((jack_client = jack_client_new (port_name)) == 0) && client_iterator < 2);
-        
+
+            jack_client = jack_client_open (port_name, JackNullOption, &status, NULL);
+            if (status & JackServerFailed) {
+              fprintf(stderr,"unable to connect to JACK server\n");
+              jack_client=NULL;
+              break;
+            }
+          } while (status & JackNameNotUnique);
+
+          if(status) {
+            if (status & JackServerStarted) {
+              fprintf(stderr, "started JACK server\n");
+            } else {
+              fprintf(stderr, "jack returned status %d\n", status);
+            }
+          }
           
           if (!jack_client) { // jack spits out enough messages already, do not warn
             sys_inchannels = sys_outchannels = 0;
@@ -305,11 +322,21 @@
         for (j = 0; j < inchans; j++) {
                 sprintf(port_name, "input%d", j);
                 if (!input_port[j]) input_port[j] = jack_port_register (jack_client, port_name, JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0);
+                if (!input_port[j]) {
+                  fprintf (stderr, "jack: can only register %d input ports (instead of requested %d)\n", j, inchans);
+                  sys_inchannels = inchans = j;
+                  break;
+                }
         }
 
         for (j = 0; j < outchans; j++) {
                 sprintf(port_name, "output%d", j);
                 if (!output_port[j]) output_port[j] = jack_port_register (jack_client, port_name, JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0);
+                if (!output_port[j]) {
+                  fprintf (stderr, "jack: can only register %d output ports (instead of requested %d)\n", j, outchans);
+                  sys_outchannels = outchans = j;
+                  break;
+                }
         } 
         outport_count = outchans;