diff --git a/dsp-block-test/audio.h b/dsp-block-test/audio.h
index e5cb676a..c56d8b8e 100644
--- a/dsp-block-test/audio.h
+++ b/dsp-block-test/audio.h
@@ -14,7 +14,7 @@
  * to switch buffers and perform deinterleaving.
  * otherwise, copy and deinterleave in the ISR
  */
-#define DMA_DEINTERLEAVE_PINGPONG 0
+#define DMA_DEINTERLEAVE_PINGPONG 1
 
 //! channel count
 #define CHANNELS 4
diff --git a/dsp-block-test/dma.c b/dsp-block-test/dma.c
index 3d6abe34..d391dac9 100644
--- a/dsp-block-test/dma.c
+++ b/dsp-block-test/dma.c
@@ -6,16 +6,18 @@
 #include "dma.h"
 
 #if DMA_DEINTERLEAVE_PINGPONG
-// use descriptor mode to perform pingpong and deinterleave
+// use large descriptor mode to perform pingpong and deinterleave
 
 typedef struct {
-   void *next;
-   void *start;
-   short config;
-   short x_count;
-   short x_mod;
-   short y_count;
-   short y_mod;
+  void *next;        // NDPL, NDPH
+  void *start;       // SAL, SAH
+  /*
+  short config;      // DMACFG
+  short x_count;     // XCNT
+  short x_mod;       // XMOD
+  short y_count;     // YCNT
+  short y_mod;       // YMOD
+  */
 } dma_desc_t;
 
 // for deinterleaving, inner loop over number of channels
@@ -27,15 +29,16 @@ typedef struct {
 // each outer-loop increment, jump back to the next frame in the first channel
 #define Y_MOD (((1 - CHANNELS) * BLOCKSIZE + 1) * SAMPLESIZE)
 
-#define DMA_FLOW_DESC 0x7700
+// large descriptor list, first 4 registers only (NDPL, NDPH, SAL, SAH)
+#define DMA_FLOW_DESC 0x7400
 // NB: need interrupt on both TX and RX to ensure correct process order 
-#define DMA_CONFIG ( WDSIZE_32 | DMA_FLOW_DESC | DI_EN | DMA2D )
+#define DMA_CONFIG ( DMA_FLOW_DESC | WDSIZE_32 | DI_EN | DMA2D )
 
-dma_desc_t descRx1 = { NULL, inputChannels1, WNR | DMA_CONFIG, X_COUNT, X_MOD, Y_COUNT, Y_MOD };
-dma_desc_t descRx0 = { &descRx1, inputChannels0, WNR | DMA_CONFIG, X_COUNT, X_MOD, Y_COUNT, Y_MOD };
+dma_desc_t descRx1 = { NULL, inputChannels1 };        //, DMA_CONFIG | WNR, X_COUNT, X_MOD, Y_COUNT, Y_MOD };
+dma_desc_t descRx0 = { &descRx1, inputChannels0 };    //, DMA_CONFIG | WNR, X_COUNT, X_MOD, Y_COUNT, Y_MOD };
 
-dma_desc_t descTx1 = { NULL, outputChannels1, DMA_CONFIG, X_COUNT, X_MOD, Y_COUNT, Y_MOD };
-dma_desc_t descTx0 = { &descTx1, outputChannels0, DMA_CONFIG, X_COUNT, X_MOD, Y_COUNT, Y_MOD };
+dma_desc_t descTx1 = { NULL, outputChannels1 };       //, DMA_CONFIG, X_COUNT, X_MOD, Y_COUNT, Y_MOD };
+dma_desc_t descTx0 = { &descTx1, outputChannels0 };   //, DMA_CONFIG, X_COUNT, X_MOD, Y_COUNT, Y_MOD };
 
 
 void init_dma(void) {
@@ -49,8 +52,21 @@ void init_dma(void) {
   descRx1.next = &descRx0;
   descTx1.next = &descTx0;
 
+  *pDMA1_X_COUNT = X_COUNT;
+  *pDMA1_X_MODIFY = X_MOD;
+  *pDMA1_Y_COUNT = Y_COUNT;
+  *pDMA1_Y_MODIFY = Y_MOD;
   *pDMA1_NEXT_DESC_PTR = &descRx0;
+  //*pDMA1_START_ADDR = descRx0.start;
+  *pDMA1_CONFIG = DMA_CONFIG | WNR;
+
+  *pDMA2_X_COUNT = X_COUNT;
+  *pDMA2_X_MODIFY = X_MOD;
+  *pDMA2_Y_COUNT = Y_COUNT;
+  *pDMA2_Y_MODIFY = Y_MOD;
   *pDMA2_NEXT_DESC_PTR = &descTx0;
+  //*pDMA2_START_ADDR = descTx0.start;
+  *pDMA2_CONFIG = DMA_CONFIG;
 }
 
 #else // 1d, autobuffer mode (no de-interleave, no pingpong
diff --git a/dsp-block-test/dsp-block-test b/dsp-block-test/dsp-block-test
index 21f1695b..d536d269 100755
Binary files a/dsp-block-test/dsp-block-test and b/dsp-block-test/dsp-block-test differ
diff --git a/dsp-block-test/main.c b/dsp-block-test/main.c
index ed5cdecf..7c2eb4c0 100644
--- a/dsp-block-test/main.c
+++ b/dsp-block-test/main.c
@@ -77,8 +77,8 @@ void init_codec(void) {
 void enable_dma_sport0(void) { 
   *pDMA2_CONFIG	= (*pDMA2_CONFIG | DMAEN);
   *pDMA1_CONFIG	= (*pDMA1_CONFIG | DMAEN);
-  *pSPORT0_TCR1 	= (*pSPORT0_TCR1 | TSPEN);
-  *pSPORT0_RCR1 	= (*pSPORT0_RCR1 | RSPEN);
+  *pSPORT0_TCR1 = (*pSPORT0_TCR1 | TSPEN);
+  *pSPORT0_RCR1 = (*pSPORT0_RCR1 | RSPEN);
 }
 
 
@@ -93,11 +93,10 @@ int main(void) {
   init_interrupts();
   init_dma();
 
-
   module_init();
   
   enable_dma_sport0();
-
+  
   // reset the codec
   init_codec();
 
diff --git a/dsp-block-test/module.c b/dsp-block-test/module.c
index 24569cd2..f4edfbd4 100644
--- a/dsp-block-test/module.c
+++ b/dsp-block-test/module.c
@@ -25,5 +25,5 @@ void module_process_block(buffer_t *inChannels, buffer_t *outChannels,
     }
   }
   
-  osc_process_block(outChannels, numChannels, numFrames);
+  //osc_process_block(outChannels, numChannels, numFrames);
 }