Small fixes.

Reduced control rate to every 30ms.
Fixed "no sound when sd card is on Teensy" by reversing the order of checking for the SD card slot.

MicroDexed.ino

@@ -28,6 +28,7 @@
 #include <Wire.h>
 #include <MIDI.h>
 #include <EEPROM.h>
+#include <SD.h>
 #include "midi_devices.hpp"
 #include "dexed.h"
 #include "dexed_sysex.h"
@@ -37,7 +38,6 @@
 #include "PluginFx.h"
 #include "UI.hpp"
 #include "source_microdexed.h"
-#include <SD.h>
 
 // Audio engines
 AudioSourceMicroDexed*    MicroDexed[NUM_DEXED];
@@ -217,9 +217,13 @@ uint32_t peak_l = 0;
 bool eeprom_update_flag = false;
 config_t configuration;
 uint8_t selected_dexed_instance = 0;
-const uint8_t cs_pins[] = { SDCARD_AUDIO_CS_PIN, SDCARD_TEENSY_CS_PIN };
-const uint8_t mosi_pins[] = { SDCARD_AUDIO_MOSI_PIN, SDCARD_TEENSY_MOSI_PIN };
-const uint8_t sck_pins[] = { SDCARD_AUDIO_SCK_PIN, SDCARD_TEENSY_SCK_PIN };
+/*const uint8_t cs_pins[] = { SDCARD_AUDIO_CS_PIN, SDCARD_TEENSY_CS_PIN };
+  const uint8_t mosi_pins[] = { SDCARD_AUDIO_MOSI_PIN, SDCARD_TEENSY_MOSI_PIN };
+  const uint8_t sck_pins[] = { SDCARD_AUDIO_SCK_PIN, SDCARD_TEENSY_SCK_PIN };*/
+const uint8_t cs_pins[] = { SDCARD_TEENSY_CS_PIN, SDCARD_AUDIO_CS_PIN };
+const uint8_t mosi_pins[] = { SDCARD_TEENSY_MOSI_PIN, SDCARD_AUDIO_MOSI_PIN };
+const uint8_t sck_pins[] = { SDCARD_TEENSY_SCK_PIN, SDCARD_AUDIO_SCK_PIN };
+char version_string[LCD_cols + 1];
 
 #if defined(USE_FX)
 // Allocate the delay lines for chorus
@@ -241,11 +245,13 @@ void setup()
   AudioNoInterrupts();
   AudioMemory(AUDIO_MEM);
 
+#ifdef DEBUG
   Serial.begin(SERIAL_SPEED);
   while (!Serial)
   {
     yield();
   }
+#endif
 
 #ifdef DISPLAY_LCD_SPI
   pinMode(SDCARD_CS_PIN, OUTPUT);
@@ -256,13 +262,11 @@ void setup()
   setup_ui();
 #else
 #ifdef DEBUG
-  //delay(320); // necessary, because before no serial output is done :(
   Serial.println(F("NO LCD DISPLAY ENABLED!"));
 #endif
 #endif
 
 #ifdef DEBUG
-  char version_string[LCD_cols + 1];
   generate_version_string(version_string, sizeof(version_string));
 
   Serial.println(F("MicroDexed based on https://github.com/asb2m10/dexed"));
@@ -384,10 +388,11 @@ void setup()
 #endif
 
   // start SD card
-  sd_card = check_sd_cards();
 #ifdef DISPLAY_LCD_SPI
   change_disp_sd(false);
 #endif
+  sd_card = check_sd_cards();
+
   if (sd_card < 1)
   {
 #ifdef DEBUG
@@ -401,9 +406,6 @@ void setup()
   }
   else
   {
-#ifdef DEBUG
-    Serial.println(F("SD card found."));
-#endif
     for (uint8_t instance_id = 0; instance_id < NUM_DEXED; instance_id++)
     {
       // read all bank names
@@ -656,6 +658,8 @@ void loop()
 #endif
     }
   }
+  else
+    yield();
 
 #if defined (DEBUG) && defined (SHOW_CPU_LOAD_MSEC)
   if (cpu_mem_millis >= SHOW_CPU_LOAD_MSEC)
@@ -1554,6 +1558,8 @@ uint32_t crc32(byte * calc_start, uint16_t calc_bytes) // base code from https:/
 void generate_version_string(char* buffer, uint8_t len)
 {
   char tmp[3];
+
+  memset(buffer, 0, len);
   strncat(buffer, VERSION, len);
 #if defined(TEENSY3_5)
   strncat(buffer, "-3.5", 4);
@@ -1570,15 +1576,16 @@ void generate_version_string(char* buffer, uint8_t len)
   itoa (MAX_NOTES, tmp, 10);
   strncat(buffer, tmp, 2);
 #endif
-  buffer[len - 1] = '\0';
 }
 
 #ifdef DISPLAY_LCD_SPI
 void change_disp_sd(bool disp)
 {
-  if (sd_card >= 0)
+  if (sd_card > 0)
+  {
     digitalWrite(sd_card, disp);
-  digitalWrite(U8X8_CS_PIN, !disp);
+    digitalWrite(U8X8_CS_PIN, !disp);
+  }
 }
 #endif
 
@@ -1590,7 +1597,7 @@ uint8_t check_sd_cards(void)
   {
 #ifdef DEBUG
     Serial.print(F("Checking CS pin "));
-    Serial.print(cs_pins[i]);
+    Serial.print(cs_pins[i], DEC);
     Serial.println(F(" for SD card"));
 #endif
     SPI.setMOSI(mosi_pins[i]);
@@ -1598,6 +1605,10 @@ uint8_t check_sd_cards(void)
 
     if (SD.begin(cs_pins[i]) == true)
     {
+#ifdef DEBUG
+      Serial.print(F("Found. Using pin "));
+      Serial.println(cs_pins[i], DEC);
+#endif
       ret = cs_pins[i];
       break;
     }

config.h

@@ -86,7 +86,7 @@
 #define MOD_FILTER_OUTPUT MOD_NO_FILTER_OUTPUT // MOD_LINKWITZ_RILEY_FILTER_OUTPUT MOD_BUTTERWORTH_FILTER_OUTPUT MOD_NO_FILTER_OUTPUT
 #define MOD_FILTER_CUTOFF_HZ 3000
 // FX-CHAIN ENABLE/DISABLE
-//#define USE_FX 1
+#define USE_FX 1
 
 //*************************************************************************************************
 //* AUDIO SOFTWARE SETTINGS
@@ -166,7 +166,7 @@
 #define U8X8_RESET_PIN 14
 #endif
 
-#define CONTROL_RATE_MS 50
+#define CONTROL_RATE_MS 30
 #define BACK_FROM_VOLUME_MS 2000
 
 //*************************************************************************************************
@@ -406,7 +406,7 @@ enum { DEXED, CHORUS, DELAY, REVERB};
 
 #define PB_STEP_MIN 0
 #define PB_STEP_MAX 12
-#define PB_STEP_DEFAULT 1
+#define PB_STEP_DEFAULT 0
 
 #define MW_RANGE_MIN 0
 #define MW_RANGE_MAX 99

dexed_sysex.cpp

@@ -77,7 +77,7 @@ bool get_voice_names_from_bank(uint8_t b, uint8_t instance_id)
   // erase all data for voice names
   memset(voice_names[instance_id], 0, MAX_VOICES * VOICE_NAME_LEN);
 
-  if (sd_card >= 0)
+  if (sd_card > 0)
   {
     char sysex_file_name[4 + VOICE_NAME_LEN];
 
@@ -182,7 +182,7 @@ uint8_t get_bank_names(uint8_t instance_id)
   // erase all data for bank names
   memset(bank_names[instance_id], 0, MAX_BANKS * BANK_NAME_LEN);
 
-  if (sd_card >= 0)
+  if (sd_card > 0)
   {
     char bankdir[4];
 
@@ -226,7 +226,7 @@ bool load_sysex(uint8_t b, uint8_t v, uint8_t instance_id)
   v = constrain(v, 0, MAX_VOICES - 1);
   b = constrain(b, 0, MAX_BANKS - 1);
 
-  if (sd_card >= 0)
+  if (sd_card > 0)
   {
     File sysex;
     char sysex_file_name[10 + VOICE_NAME_LEN];
@@ -481,7 +481,7 @@ bool load_sysex_setup(uint8_t b, uint8_t v, uint8_t instance_id)
   v = constrain(v, 0, MAX_VOICES - 1);
   b = constrain(b, 0, MAX_BANKS - 1);
 
-  if (sd_card >= 0)
+  if (sd_card > 0)
   {
     File sysex;
     char sysex_setup_file_name[SYSEXFILENAME_LEN];
@@ -527,7 +527,7 @@ bool save_sysex_setup(uint8_t b, uint8_t v, config_t configuration)
 {
   const char* sysex_filename = "config.syx";
 
-  if (sd_card >= 0)
+  if (sd_card > 0)
   {
     File sysex;
     char sysex_file_name[20];