diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 02a128fe..684db173 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,13 +1,16 @@
 sc_usb_audio Change Log
 =======================
 
-6.14.2
+6.15.1
 ------
     - RESOLVED:   DAC data mis-alignment issue in TDM slave mode
 
-6.14.1
+
+6.15.0
 ------
-    - RESOLVED:   UAC 1.0 descriptors now support multi-channel volume control (previously were
+    - CHANGE:     Removed 32kHz sample-rate support when PDM microphones enabled (lib_mic_array
+                  currently does not support non-integer decimation factors)
+    - RESOLVED:   UAC 1.0 descriptors now support multi-channel volume control (previously were 
                   hard-coded as stereo)
 
 6.14.0
diff --git a/module_usb_audio/devicedefines.h b/module_usb_audio/devicedefines.h
index 4edd7cf8..b156725d 100644
--- a/module_usb_audio/devicedefines.h
+++ b/module_usb_audio/devicedefines.h
@@ -465,7 +465,7 @@
  * @brief Device firmware version number in Binary Coded Decimal format: 0xJJMN where JJ: major, M: minor, N: sub-minor version number.
  */
 #ifndef BCD_DEVICE_M
-#define BCD_DEVICE_M             14
+#define BCD_DEVICE_M             15
 #endif
 
 /**
diff --git a/module_usb_audio/pdm_mics/mic_array_conf.h b/module_usb_audio/pdm_mics/mic_array_conf.h
index 35af7f29..8aca8c43 100644
--- a/module_usb_audio/pdm_mics/mic_array_conf.h
+++ b/module_usb_audio/pdm_mics/mic_array_conf.h
@@ -1,7 +1,6 @@
 #ifndef MIC_ARRAY_CONF_H_
 #define MIC_ARRAY_CONF_H_
 
-#define FRAME_SIZE_LOG2 0
-
+#define MAX_FRAME_SIZE_LOG2 0
 
 #endif /* MIC_ARRAY_CONF_H_ */
diff --git a/module_usb_audio/pdm_mics/pcm_pdm_mic.xc b/module_usb_audio/pdm_mics/pcm_pdm_mic.xc
index 7a791eb0..94e65c71 100644
--- a/module_usb_audio/pdm_mics/pcm_pdm_mic.xc
+++ b/module_usb_audio/pdm_mics/pcm_pdm_mic.xc
@@ -16,6 +16,8 @@
 #include "fir_decimator.h"
 #include "mic_array.h"
 
+#define MAX_DECIMATION_FACTOR 12
+
 /* Hardware resources */
 in port p_pdm_clk                = PORT_PDM_CLK;
 in buffered port:32 p_pdm_mics   = PORT_PDM_DATA;
@@ -26,12 +28,12 @@ clock pdmclk                     = on tile[PDM_TILE]: XS1_CLKBLK_3;
 unsafe void user_pdm_process(frame_audio * unsafe audio, int output[]);
 void user_pdm_init();
 
-int data_0[4*COEFS_PER_PHASE*MAX_DECIMATION_FACTOR] = {0};
-int data_1[4*COEFS_PER_PHASE*MAX_DECIMATION_FACTOR] = {0};
+int data_0[4*THIRD_STAGE_COEFS_PER_STAGE * MAX_DECIMATION_FACTOR] = {0};
+int data_1[4*THIRD_STAGE_COEFS_PER_STAGE * MAX_DECIMATION_FACTOR] = {0};
 
 frame_audio mic_audio[2];
 
-void pdm_process(streaming chanend c_ds_output_0, streaming chanend c_ds_output_1, chanend c_audio)
+void pdm_process(streaming chanend c_ds_output[2], chanend c_audio)
 {
     unsigned buffer = 1;     // Buffer index
     memset(mic_audio, sizeof(frame_audio), 0);
@@ -45,21 +47,21 @@ void pdm_process(streaming chanend c_ds_output_0, streaming chanend c_ds_output_
 
         c_audio :> samplerate;
 
-        unsigned decimationfactor = 48000/samplerate;
+        unsigned decimationfactor = 96000/samplerate;
 
         unsafe
         {
-            decimator_config_common dcc = {FRAME_SIZE_LOG2, 1, 0, 0, decimationfactor, fir_coefs[decimationfactor], 0};
-            decimator_config dc0 = {&dcc, data_0, {0, 0, 0, 0}};
-            decimator_config dc1 = {&dcc, data_1, {0, 0, 0, 0}};
-            decimator_configure(c_ds_output_0, c_ds_output_1, dc0, dc1);
-        }
+            const int * unsafe fir_coefs[7] = {0, g_third_stage_div_2_fir, g_third_stage_div_4_fir, g_third_stage_div_6_fir, g_third_stage_div_8_fir, 0, g_third_stage_div_12_fir};
 
-        decimator_init_audio_frame(c_ds_output_0, c_ds_output_1, buffer, mic_audio, DECIMATOR_NO_FRAME_OVERLAP);
+            decimator_config_common dcc = {MAX_FRAME_SIZE_LOG2, 1, 0, 0, decimationfactor, fir_coefs[decimationfactor/2], 0, 0, DECIMATOR_NO_FRAME_OVERLAP, 2};
+            decimator_config dc[2] = {{&dcc, data_0, {0, 0, 0, 0}, 4}, {&dcc, data_1, {0, 0, 0, 0}, 4}};
+            decimator_configure(c_ds_output, 2, dc);
+
+        decimator_init_audio_frame(c_ds_output, 2, buffer, mic_audio, dcc);
 
         while(1)
         {
-            frame_audio * unsafe current = decimator_get_next_audio_frame(c_ds_output_0, c_ds_output_1, buffer, mic_audio);
+            frame_audio * unsafe current = decimator_get_next_audio_frame(c_ds_output, 2, buffer, mic_audio, dcc);
 
             unsafe
             {
@@ -80,6 +82,7 @@ void pdm_process(streaming chanend c_ds_output_0, streaming chanend c_ds_output_
                     break;
                 }
             }
+            }
         }
     }
 }
@@ -91,7 +94,7 @@ void pdm_process(streaming chanend c_ds_output_0, streaming chanend c_ds_output_
 void pcm_pdm_mic(chanend c_pcm_out)
 {
     streaming chan c_4x_pdm_mic_0, c_4x_pdm_mic_1;
-    streaming chan c_ds_output_0, c_ds_output_1;
+    streaming chan c_ds_output[2];
 
     /* TODO, always run mics at 3MHz */
     configure_clock_src_divide(pdmclk, p_mclk, 2);
@@ -102,9 +105,9 @@ void pcm_pdm_mic(chanend c_pcm_out)
     par
     {
         pdm_rx(p_pdm_mics, c_4x_pdm_mic_0, c_4x_pdm_mic_1);
-        decimate_to_pcm_4ch(c_4x_pdm_mic_0, c_ds_output_0);
-        decimate_to_pcm_4ch(c_4x_pdm_mic_1, c_ds_output_1);
-        pdm_process(c_ds_output_0, c_ds_output_1, c_pcm_out);
+        decimate_to_pcm_4ch(c_4x_pdm_mic_0, c_ds_output[0]);
+        decimate_to_pcm_4ch(c_4x_pdm_mic_1, c_ds_output[1]);
+        pdm_process(c_ds_output, c_pcm_out);
     }
 }