diff --git a/extras/miniaudio_split/miniaudio.c b/extras/miniaudio_split/miniaudio.c
index 082bf38b..e4e13b39 100644
--- a/extras/miniaudio_split/miniaudio.c
+++ b/extras/miniaudio_split/miniaudio.c
@@ -1,6 +1,6 @@
 /*
 Audio playback and capture library. Choice of public domain or MIT-0. See license statements at the end of this file.
-miniaudio - v0.10.39 - 2021-07-20
+miniaudio - v0.10.40 - 2021-07-23
 
 David Reid - mackron@gmail.com
 
@@ -16546,10 +16546,11 @@ static ma_result ma_device_write_to_stream__pulse(ma_device* pDevice, ma_pa_stre
 
             framesMapped = bytesMapped / bpf;
 
-            if (deviceState == MA_STATE_STARTED) {
+            if (deviceState == MA_STATE_STARTED || deviceState == MA_STATE_STARTING) {  /* Check for starting state just in case this is being used to do the initial fill. */
                 ma_device_handle_backend_data_callback(pDevice, pMappedPCMFrames, NULL, framesMapped);
             } else {
-                /* Device is not started. Don't write anything to it. */
+                /* Device is not started. Write silence. */
+                ma_silence_pcm_frames(pMappedPCMFrames, framesMapped, pDevice->playback.format, pDevice->playback.channels);
             }
 
             pulseResult = ((ma_pa_stream_write_proc)pDevice->pContext->pulse.pa_stream_write)(pStream, pMappedPCMFrames, bytesMapped, NULL, 0, MA_PA_SEEK_RELATIVE);
@@ -16757,6 +16758,9 @@ static ma_result ma_device_init__pulse(ma_device* pDevice, const ma_device_confi
         /* The callback needs to be set before connecting the stream. */
         ((ma_pa_stream_set_read_callback_proc)pDevice->pContext->pulse.pa_stream_set_read_callback)((ma_pa_stream*)pDevice->pulse.pStreamCapture, ma_device_on_read__pulse, pDevice);
 
+        /* State callback for checking when the device has been corked. */
+        ((ma_pa_stream_set_suspended_callback_proc)pDevice->pContext->pulse.pa_stream_set_suspended_callback)((ma_pa_stream*)pDevice->pulse.pStreamCapture, ma_device_on_suspended__pulse, pDevice);
+
 
         /* Connect after we've got all of our internal state set up. */
         streamFlags = MA_PA_STREAM_START_CORKED | MA_PA_STREAM_ADJUST_LATENCY | MA_PA_STREAM_FIX_FORMAT | MA_PA_STREAM_FIX_RATE | MA_PA_STREAM_FIX_CHANNELS;
@@ -16848,7 +16852,6 @@ static ma_result ma_device_init__pulse(ma_device* pDevice, const ma_device_confi
 
         attr = ma_device__pa_buffer_attr_new(pDescriptorPlayback->periodSizeInFrames, pDescriptorPlayback->periodCount, &ss);
 
-        ma_log_postf(ma_device_get_log(pDevice), MA_LOG_LEVEL_DEBUG, "[PulseAudio] Playback attr: maxlength=%d, tlength=%d, prebuf=%d, minreq=%d, fragsize=%d; periodSizeInFrames=%d\n", attr.maxlength, attr.tlength, attr.prebuf, attr.minreq, attr.fragsize, pDescriptorPlayback->periodSizeInFrames);
         ma_log_postf(ma_device_get_log(pDevice), MA_LOG_LEVEL_DEBUG, "[PulseAudio] Playback attr: maxlength=%d, tlength=%d, prebuf=%d, minreq=%d, fragsize=%d; periodSizeInFrames=%d\n", attr.maxlength, attr.tlength, attr.prebuf, attr.minreq, attr.fragsize, pDescriptorPlayback->periodSizeInFrames);
 
         pDevice->pulse.pStreamPlayback = ma_context__pa_stream_new__pulse(pDevice->pContext, pConfig->pulse.pStreamNamePlayback, &ss, &cmap);
@@ -34352,7 +34355,7 @@ static ma_result ma_channel_converter_process_pcm_frames__stereo_to_mono(ma_chan
             const float* pFramesInF32  = (const float*)pFramesIn;
 
             for (iFrame = 0; iFrame < frameCount; ++iFrame) {
-                pFramesOutF32[iFrame] = (pFramesInF32[iFrame*2+0] + pFramesInF32[iFrame*2+0]) * 0.5f;
+                pFramesOutF32[iFrame] = (pFramesInF32[iFrame*2+0] + pFramesInF32[iFrame*2+1]) * 0.5f;
             }
         } break;
 
diff --git a/extras/miniaudio_split/miniaudio.h b/extras/miniaudio_split/miniaudio.h
index e8edfa53..4ffa0091 100644
--- a/extras/miniaudio_split/miniaudio.h
+++ b/extras/miniaudio_split/miniaudio.h
@@ -1,6 +1,6 @@
 /*
 Audio playback and capture library. Choice of public domain or MIT-0. See license statements at the end of this file.
-miniaudio - v0.10.39 - 2021-07-20
+miniaudio - v0.10.40 - 2021-07-23
 
 David Reid - mackron@gmail.com
 
@@ -20,7 +20,7 @@ extern "C" {
 
 #define MA_VERSION_MAJOR    0
 #define MA_VERSION_MINOR    10
-#define MA_VERSION_REVISION 39
+#define MA_VERSION_REVISION 40
 #define MA_VERSION_STRING   MA_XSTRINGIFY(MA_VERSION_MAJOR) "." MA_XSTRINGIFY(MA_VERSION_MINOR) "." MA_XSTRINGIFY(MA_VERSION_REVISION)
 
 #if defined(_MSC_VER) && !defined(__clang__)
diff --git a/miniaudio.h b/miniaudio.h
index dcee545f..27425c72 100644
--- a/miniaudio.h
+++ b/miniaudio.h
@@ -1,6 +1,6 @@
 /*
 Audio playback and capture library. Choice of public domain or MIT-0. See license statements at the end of this file.
-miniaudio - v0.10.40 - TBD
+miniaudio - v0.10.40 - 2021-07-23
 
 David Reid - mackron@gmail.com
 
@@ -69399,7 +69399,7 @@ The following miscellaneous changes have also been made.
 /*
 REVISION HISTORY
 ================
-v0.10.40 - TBD
+v0.10.40 - 2021-07-23
   - Fix a bug when converting from stereo to mono.
   - PulseAudio: Fix a glitch when pausing and resuming a device.