diff --git a/main.c b/main.c
index a3c4f67..193651b 100644
--- a/main.c
+++ b/main.c
@@ -23,7 +23,9 @@
 //#include "hal_serial.h"
 
 #include "usbcfg.h"
+#ifdef __VNA__
 #include "si5351.h"
+#endif
 #include "nanovna.h"
 #ifdef __VNA__
 #include "fft.h"
@@ -713,7 +715,7 @@ duplicate_buffer_to_dump(int16_t *p)
   memcpy(dump_buffer, p, sizeof dump_buffer);
 }
 #endif
-
+#ifdef __AUDIO__
 void i2s_end_callback(I2SDriver *i2sp, size_t offset, size_t n)
 {
 #if PORT_SUPPORTS_RT
@@ -755,6 +757,7 @@ static const I2SConfig i2sconfig = {
   2 // i2spr
 };
 #endif
+#endif
 
 #define MAX_DATA    2
 VNA_SHELL_FUNCTION(cmd_data)
@@ -2652,7 +2655,7 @@ THD_FUNCTION(myshellThread, p)
 }
 #endif
 
-#if 1
+#ifdef __VNA__
 // I2C clock bus setting: depend from STM32_I2C1SW in mcuconf.h
 static const I2CConfig i2ccfg = {
   .timingr  = STM32_TIMINGR_PRESC(0U)  |            /* 72MHz I2CCLK. ~ 600kHz i2c   */
@@ -2755,8 +2758,10 @@ int main(void)
 
   //palSetPadMode(GPIOB, 8, PAL_MODE_ALTERNATE(1) | PAL_STM32_OTYPE_OPENDRAIN);
   //palSetPadMode(GPIOB, 9, PAL_MODE_ALTERNATE(1) | PAL_STM32_OTYPE_OPENDRAIN);
+#ifdef __VNA__
   i2cStart(&I2CD1, &i2ccfg);
   si5351_init();
+#endif
 
 #ifdef __SI4432__
  /*
diff --git a/mcuconf.h b/mcuconf.h
index 9520c1c..be724e5 100644
--- a/mcuconf.h
+++ b/mcuconf.h
@@ -134,7 +134,7 @@
 /*
  * I2C driver system settings.
  */
-#define STM32_I2C_USE_I2C1                  TRUE
+#define STM32_I2C_USE_I2C1                  FALSE
 #define STM32_I2C_USE_I2C2                  FALSE
 #define STM32_I2C_BUSY_TIMEOUT              50
 #define STM32_I2C_I2C1_IRQ_PRIORITY         3
diff --git a/nanovna.h b/nanovna.h
index 7bb485e..6c0858e 100644
--- a/nanovna.h
+++ b/nanovna.h
@@ -37,7 +37,7 @@
 #define __SELFTEST__
 #define __CALIBRATE__
 #define __FAST_SWEEP__          // Pre-fill SI4432 RSSI buffer  to get fastest sweep in zero span mode
-#define __AUDIO__
+// #define __AUDIO__
 #define __HAM_BAND__
 //#define __ULTRA__             // Add harmonics mode on low input.
 //#define __ULTRA_SA__            // Adds ADF4351 control for extra high 1st IF stage
diff --git a/sa_core.c b/sa_core.c
index 124552b..0127541 100644
--- a/sa_core.c
+++ b/sa_core.c
@@ -218,7 +218,9 @@ uint32_t calc_min_sweep_time_us(void)         // Estimate minimum sweep time in
     t = 200*sweep_points;                   // 200 microseconds is the delay set in perform when sweeping in output mode
   else {
     uint32_t bare_sweep_time=0;
+#ifdef __SI4432__
     bare_sweep_time = (SI4432_step_delay + MEASURE_TIME) * (sweep_points); // Single RSSI delay and measurement time in uS while scanning
+#endif
     if (FREQ_IS_CW()) {
       bare_sweep_time = MINIMUM_SWEEP_TIME;       // minimum sweep time in fast CW mode
       if (setting.repeat != 1 || setting.sweep_time_us >= 100*ONE_MS_TIME || setting.spur_removal != 0) // if no fast CW sweep possible
@@ -3746,7 +3748,7 @@ void self_test(int test)
     ili9341_clear_screen();
     reset_settings(M_LOW);
     set_refer_output(-1);
-#ifdef DOESNOTFIT
+#ifndef DOESNOTFIT
   } else if (test == 1) {
     float p2, p1, p;
     in_selftest = true;               // Spur search
@@ -3772,7 +3774,7 @@ void self_test(int test)
       f = 400000;
       while (f < DEFAULT_MAX_FREQ) {
         p = PURE_TO_float(perform(false, 1, f, false));
-#define SPUR_DELTA  6
+#define SPUR_DELTA  15
         if ( p2 < p1 - SPUR_DELTA  && p < p1 - SPUR_DELTA) {
           shell_printf("Spur of %4.2f at %d with count %d\n\r", p1,(f - setting.frequency_step)/1000, add_spur(f - setting.frequency_step));
         }
diff --git a/si5351.c b/si5351.c
index 572189d..e421908 100644
--- a/si5351.c
+++ b/si5351.c
@@ -19,6 +19,7 @@
  */
 #include "hal.h"
 #include "nanovna.h"
+#ifdef __VNA__
 #include "si5351.h"
 
 #define SI5351_I2C_ADDR   	(0x60<<1)
@@ -463,3 +464,4 @@ int si5351_set_frequency_with_offset(uint32_t freq, int offset, uint8_t drive_st
   current_band = band;
   return delay;
 }
+#endif
diff --git a/tlv320aic3204.c b/tlv320aic3204.c
index 4ebfb9e..788509a 100644
--- a/tlv320aic3204.c
+++ b/tlv320aic3204.c
@@ -17,9 +17,10 @@
  * the Free Software Foundation, Inc., 51 Franklin Street,
  * Boston, MA 02110-1301, USA.
  */
+
 #include "hal.h"
 #include "nanovna.h"
-
+#ifdef __AUDIO__
 #define REFCLK_8000KHZ
 #define AIC3204_ADDR 0x18
 
@@ -64,7 +65,7 @@ static const uint8_t conf_data_routing[] = {
   2, 0x01, 0x08, /* Disable Internal Crude AVdd in presence of external AVdd supply or before powering up internal AVdd LDO*/
   2, 0x02, 0x01, /* Enable Master Analog Power Control */
   2, 0x7b, 0x01, /* Set the REF charging time to 40ms */
-  2, 0x14, 0x25, /* HP soft stepping settings for optimal pop performance at power up Rpop used is 6k with N = 6 and soft step = 20usec. This should work with 47uF coupling capacitor. Can try N=5,6 or 7 time constants as well. Trade-off delay vs “pop” sound. */
+  2, 0x14, 0x25, /* HP soft stepping settings for optimal pop performance at power up Rpop used is 6k with N = 6 and soft step = 20usec. This should work with 47uF coupling capacitor. Can try N=5,6 or 7 time constants as well. Trade-off delay vs sound. */
   2, 0x0a, 0x33, /* Set the Input Common Mode to 0.9V and Output Common Mode for Headphone to 1.65V */
 
   2, 0x3d, 0x00, /* Select ADC PTM_R4 */
@@ -152,3 +153,4 @@ void tlv320aic3204_set_gain(int lgain, int rgain)
     };
     tlv320aic3204_config(data);
 }
+#endif