Trigger GPO key using X key instead of square key

- Add note GPO trigger on example workflow page

Author: cjsha

articles/hardware/hs64/gpo-trigger.md

@@ -5,7 +5,7 @@ title: Headstage 64 GPO Trigger
 
 The following excerpt from the Headstage 64 [example
 workflow](xref:hs64_workflow) demonstrates triggering a stimulus following a
-press of the □ key on the breakout board. The GPO trigger uses a pin on the
+press of the X key on the breakout board. The GPO trigger uses a pin on the
 headstage to trigger stimulus more instantaneously than other trigger methods
 that write to a register on the hardware which takes more time. However, this
 trigger operator does not provide stimulus feedback as discussed in

articles/hardware/hs64/workflow.md

@@ -10,6 +10,7 @@ The example workflow below can by copy/pasted into the Bonsai editor using the c
 - Automatically commutates the tether if there is a proper commutator connection. 
 - Applies electrical stimulation triggered by pressing the breakout board's △ key.
 - Applies optical stimulation triggered by pressing the breakout board's ◯ key.
+- Applies both stimulation types with a lower latency trigger mechanism by pressing the breakout board's X key.
 - Monitors memory usage data.
 
 ::: workflow

workflows/hardware/hs64/hs64.bonsai

@@ -396,7 +396,7 @@
       </Expression>
       <Expression xsi:type="HasFlag">
         <Operand xsi:type="WorkflowProperty" TypeArguments="onix1:BreakoutButtonState">
-          <Value>Square</Value>
+          <Value>X</Value>
         </Operand>
       </Expression>
       <Expression xsi:type="Combinator">
@@ -471,12 +471,11 @@
       <Edge From="14" To="15" Label="Source1" />
       <Edge From="16" To="17" Label="Source1" />
       <Edge From="17" To="18" Label="Source1" />
+      <Edge From="18" To="19" Label="Source1" />
       <Edge From="19" To="20" Label="Source1" />
-      <Edge From="20" To="21" Label="Source1" />
       <Edge From="21" To="22" Label="Source1" />
+      <Edge From="22" To="23" Label="Source1" />
       <Edge From="23" To="24" Label="Source1" />
-      <Edge From="24" To="25" Label="Source1" />
-      <Edge From="24" To="28" Label="Source1" />
       <Edge From="25" To="26" Label="Source1" />
       <Edge From="26" To="27" Label="Source1" />
       <Edge From="26" To="32" Label="Source1" />