diff --git a/libs/ardour/session_process.cc b/libs/ardour/session_process.cc
index ca1f3b9b7a..1674cd9a7a 100644
--- a/libs/ardour/session_process.cc
+++ b/libs/ardour/session_process.cc
@@ -409,13 +409,11 @@ Session::process_with_events (pframes_t nframes)
 
 		if (!_exporting && _slave) {
 			if (!follow_slave (nframes)) {
-				cerr << "P-w-E: FS fail\n";
 				return;
 			}
 		}
 
 		if (_transport_speed == 0) {
-			cerr << "P-w-E: ts = 0\n";
 			no_roll (nframes);
 			return;
 		}
@@ -429,7 +427,6 @@ Session::process_with_events (pframes_t nframes)
 		samplepos_t stop_limit = compute_stop_limit ();
 
 		if (maybe_stop (stop_limit)) {
-			cerr << "P-w-E: mebbe stop\n";
 			no_roll (nframes);
 			return;
 		}
@@ -461,7 +458,6 @@ Session::process_with_events (pframes_t nframes)
 				click (_transport_sample, this_nframes);
 
 				if (process_routes (this_nframes, session_needs_butler)) {
-					cerr << "P-w-E: PR fail\n";
 					fail_roll (nframes);
 					return;
 				}
@@ -476,8 +472,6 @@ Session::process_with_events (pframes_t nframes)
 					increment_transport_position (samples_moved);
 				}
 
-				cerr << "P-w-E: ts now = " << _transport_sample << endl;
-
 				maybe_stop (stop_limit);
 				check_declick_out ();
 			}
@@ -502,7 +496,6 @@ Session::process_with_events (pframes_t nframes)
 			/* if an event left our state changing, do the right thing */
 
 			if (nframes && non_realtime_work_pending()) {
-				cerr << "P-w-E: nrtwp no roll\n";
 				no_roll (nframes);
 				break;
 			}
@@ -515,8 +508,6 @@ Session::process_with_events (pframes_t nframes)
 
 	} /* implicit release of route lock */
 
-	cerr << "P-w-E: final ts = " << _transport_sample << endl;
-
 	if (session_needs_butler) {
 		DEBUG_TRACE (DEBUG::Butler, "p-with-events: session needs butler, call it\n");
 		_butler->summon ();