diff --git a/config.h b/config.h
index cec32b0..c42f371 100644
--- a/config.h
+++ b/config.h
@@ -30,6 +30,7 @@
 
 // ATTENTION! For better latency you have to redefine AUDIO_BLOCK_SAMPLES from
 // 128 to 64 in <ARDUINO-IDE-DIR>/cores/teensy3/AudioStream.h
+#define AUDIO_BLOCK_SAMPLES 64
 
 // If you want to test the system with Linux and withous any keyboard and/or audio equipment, you can do the following:
 // 1. In Arduino-IDE enable "Tools->USB-Type->Serial + MIDI + Audio"
@@ -38,6 +39,7 @@
 // $ aplaymidi -p 20:0 <MIDI-File> # e.g. test.mid
 // $ arecord -f cd -Dhw:1,0 /tmp/bla.wav
 
+
 #define VERSION "0.9.7"
 
 //*************************************************************************************************
@@ -112,8 +114,8 @@
 //* UI
 //*************************************************************************************************
 #define ENABLE_LCD_UI 1
-//#define STANDARD_LCD_I2C
-#define OLED_SPI
+#define STANDARD_LCD_I2C
+//#define OLED_SPI
 
 
 // LCD Display