Minimum max buffers is now 2, as 1 doesn't work with this head/tail s…

…cheme

gui/index.html

@@ -2848,9 +2848,9 @@ <h3>Audio Connections</h3>
 	</table>
 	<h3>Functions</h3>
 	<p class=func><span class=keyword>setMaxBuffers</span>(uint8);</p>
-	<p class=desc>Set the maximum buffer count for the queue to limit its size - by default 32 buffers are used on Teensy3's
+	<p class=desc>Set the maximum buffer block count for the queue to limit its size - by default 32 blocks are used on Teensy3's
 	  and 80 on Teeny 4's - this allows the value to be reduced so that the queue cannot get too far ahead, nor use up lots of
-	  audio blocks you might want for other purposes.
+	  audio blocks you might want for other purposes.  The minimum number of buffer blocks is 2.
 	</p>
 	<p class=func><span class=keyword>play</span>(int16);</p>
 	<p class=desc>add a single sample to the queue - no need to use getBuffer() or playBuffer() as this

play_queue.cpp

@@ -30,8 +30,8 @@
 
 void AudioPlayQueue::setMaxBuffers(uint8_t maxb)
 {
-  if (maxb < 1)
-    maxb = 1 ;
+  if (maxb < 2)
+    maxb = 2 ;
   if (maxb > MAX_BUFFERS)
     maxb = MAX_BUFFERS ;
   max_buffers = maxb ;