diff --git a/TODO b/TODO
index 2fc4209..5a4941a 100644
--- a/TODO
+++ b/TODO
@@ -1,7 +1,6 @@
 -figure out all magic commands
 -make complete gui
 -amp/cabinet models
--audio setup options
 -tone library
 -effects library
 -effects level
diff --git a/gdigi.h b/gdigi.h
index 8ebe2c1..66587b0 100644
--- a/gdigi.h
+++ b/gdigi.h
@@ -455,6 +455,10 @@ enum {
 #define EXP_MIN 8195
 #define EXP_MAX 8196
 
+#define USB_POSITION 0
+#define USB_AUDIO_PLAYBACK_MIX 12297
+#define USB_AUDIO_LEVEL 12307
+
 void set_option(guint id, guint position, guint value);
 void set_wah_min(int level);
 void set_wah_max(int level);
diff --git a/tests.c b/tests.c
index 5e60ffc..daba2c2 100644
--- a/tests.c
+++ b/tests.c
@@ -861,6 +861,17 @@ void test_exp()
         set_option(EXP_MAX, EXP_POSITION, x);
 }
 
+void test_usb()
+{
+    int x;
+
+    for (x=0; x<=100; x++)
+        set_option(USB_AUDIO_PLAYBACK_MIX, USB_POSITION, x);
+
+    for (x=0; x<=36; x++)
+        set_option(USB_AUDIO_LEVEL, USB_POSITION, x);
+}
+
 void test_all()
 {
     test_wah();
@@ -874,4 +885,5 @@ void test_all()
     test_delay();
     test_reverb();
     test_exp();
+    test_usb();
 }
diff --git a/tests.h b/tests.h
index 7621a46..d65a97f 100644
--- a/tests.h
+++ b/tests.h
@@ -27,4 +27,5 @@ void test_chorusfx();
 void test_delay();
 void test_reverb();
 void test_exp();
+void test_usb();
 void test_all();