Fixup to get main demo working

This adds some unnecessary stuff into the debug core  that I used to
troubleshoot. There are like 5 bugfixes here. Especially of note is the
low freq clock gen, I was trying to use modulo like you would do in a
computer program but it was too slow, so I had to move the logic around
a bunch.

design/audio/audio_buffer.sv

@@ -0,0 +1,7 @@
+//this interfaces with block ram
+module audio_buffer(
+    input logic clk, reset,
+    
+
+
+);