diff --git a/Makefile.m1 b/Makefile.m1
index 0c132a4..4ca5fd5 100644
--- a/Makefile.m1
+++ b/Makefile.m1
@@ -1,7 +1,7 @@
 # OSX 11.0+ arm64 only
-OPTS = -DPORTAUDIO -DALAC -DOPUS -DRESAMPLE -DLINKALL -DVISEXPORT -DDSD -DUSE_SSL -I./includem1 -I./includem1/opus -I./includem1/alac -arch arm64 -O3 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.1.sdk -mmacosx-version-min=11.0
+OPTS = -DPORTAUDIO -DALAC -DOPUS -DRESAMPLE -DLINKALL -DVISEXPORT -DDSD -DUSE_SSL -I./includem1 -I./includem1/opus -I./includem1/alac -arch arm64 -O3 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk -mmacosx-version-min=11.0
 
-LDFLAGS = -arch arm64 -Wl,-syslibroot,/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.1.sdk -mmacosx-version-min=11.0 -L./libm1
+LDFLAGS = -arch arm64 -Wl,-syslibroot,/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk -mmacosx-version-min=11.0 -L./libm1
 
 LDADD = -lportaudio -lpthread -ldl -lm -framework CoreVideo -framework VideoDecodeAcceleration -framework CoreAudio -framework AudioToolbox -framework AudioUnit -framework Carbon
 
diff --git a/flac.c b/flac.c
index 8475c04..65ea4c8 100644
--- a/flac.c
+++ b/flac.c
@@ -123,6 +123,10 @@
 
 	*want = bytes;
 
+	// if there's nothing in the stream buffer, libFLAC will continuously call this function as quickly as possible. slow it down.
+	if (!bytes && !end)
+		usleep(1000);
+
 	return end ? FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM : FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
 }
 
diff --git a/opus.c b/opus.c
index ee75476..1b80006 100644
--- a/opus.c
+++ b/opus.c
@@ -230,7 +230,6 @@
 		if (stream.state <= DISCONNECT) {
 			LOG_INFO("partial decode");
 			UNLOCK_O_direct;
-			UNLOCK_S;
 			return DECODE_COMPLETE;
 		} else {
 			LOG_INFO("no frame decoded");
diff --git a/output.c b/output.c
index 99d4cc4..a5044fe 100644
--- a/output.c
+++ b/output.c
@@ -391,7 +391,7 @@
 	output.idle_to = (u32_t) idle;
 
 	/* Skip test_open for stdout, set default sample rates */
-	if ( output.device[0] == '-' ) {
+	if ( output.device[0] == '-' || user_rates ) {
 		for (i = 0; i < MAX_SUPPORTED_SAMPLERATES; ++i) {
 			output.supported_rates[i] = rates[i];
 		}
@@ -400,12 +400,6 @@
 		if (!test_open(output.device, output.supported_rates, user_rates)) {
 			LOG_ERROR("unable to open output device: %s", output.device);
 			exit(0);
-		}
-	}
-
-	if (user_rates) {
-		for (i = 0; i < MAX_SUPPORTED_SAMPLERATES; ++i) {
-			output.supported_rates[i] = rates[i];
 		}
 	}
 
diff --git a/output_alsa.c b/output_alsa.c
index 125a737..edbbf42 100644
--- a/output_alsa.c
+++ b/output_alsa.c
@@ -297,6 +297,9 @@
 			if (snd_pcm_hw_params_test_rate(pcm, hw_params, ref[i], 0) == 0) {
 				rates[ind++] = ref[i];
 			}
+			else {
+				LOG_DEBUG("sample rate %u not supported", ref[i]);
+			}
 		}
 	}
 
diff --git a/output_pa.c b/output_pa.c
index 96b135d..facbba0 100644
--- a/output_pa.c
+++ b/output_pa.c
@@ -214,6 +214,7 @@
 #endif
 		switch (err) {
 			case paInvalidSampleRate:
+				LOG_DEBUG("sample rate %u not supported", ref[i]);
 				continue;
 #if WIN
 #ifndef PA18API
diff --git a/pcm.c b/pcm.c
index 83d4e61..ac609f6 100644
--- a/pcm.c
+++ b/pcm.c
@@ -63,7 +63,7 @@
 #define MAX_DECODE_FRAMES 4096
 
 static u32_t sample_rates[] = {
-	11025, 22050, 32000, 44100, 48000, 8000, 12000, 16000, 24000, 96000, 88200, 176400, 192000, 352800, 384000, 705600, 768000
+	11025, 22050, 32000, 44100, 48000, 8000, 12000, 16000, 24000, 96000, 88200, 176400, 192000, 352800, 384000, 705600, 768000, 1411200, 1536000
 };
 
 static u32_t sample_rate;
diff --git a/squeezelite.h b/squeezelite.h
index c86392c..e70d9a1 100644
--- a/squeezelite.h
+++ b/squeezelite.h
@@ -26,7 +26,7 @@
 
 #define MAJOR_VERSION "1.9"
 #define MINOR_VERSION "9"
-#define MICRO_VERSION "1386"
+#define MICRO_VERSION "1392"
 
 #if defined(CUSTOM_VERSION)
 #define VERSION "v" MAJOR_VERSION "." MINOR_VERSION "-" MICRO_VERSION STR(CUSTOM_VERSION)
@@ -617,8 +617,8 @@
 
 #define MONO_RIGHT	0x02
 #define MONO_LEFT	0x01
-#define MAX_SUPPORTED_SAMPLERATES 18
-#define TEST_RATES = { 768000, 705600, 384000, 352800, 192000, 176400, 96000, 88200, 48000, 44100, 32000, 24000, 22500, 16000, 12000, 11025, 8000, 0 }
+#define MAX_SUPPORTED_SAMPLERATES 20
+#define TEST_RATES = { 1536000, 1411200, 768000, 705600, 384000, 352800, 192000, 176400, 96000, 88200, 48000, 44100, 32000, 24000, 22500, 16000, 12000, 11025, 8000, 0 }
 
 struct outputstate {
 	output_state state;