diff --git a/configs/probe_basic/probe_basic.ini b/configs/probe_basic/probe_basic.ini
index a37d7d5..4864825 100644
--- a/configs/probe_basic/probe_basic.ini
+++ b/configs/probe_basic/probe_basic.ini
@@ -70,12 +70,17 @@ Z_TOOL_CLEARANCE_HEIGHT = 0.0000
 # This just adjust the speed of the ATC tab Carousel GFX rotation (default if omitted is 1000ms)
 STEP_TIME = 500
 
+[PYTHON]
+TOPLEVEL = ./python/toplevel.py
+PATH_APPEND = ./python/
+
 [RS274NGC]
 RS274NGC_STARTUP_CODE = F10 S300 G20 G17 G40 G49 G54 G64 P0.001 G80 G90 G91.1 G92.1 G94 G97 G98
 PARAMETER_FILE = sim.var
 OWORD_NARGS = 1
 NO_DOWNCASE_OWORD = 1
 SUBROUTINE_PATH = subroutines
+REMAP=M6  modalgroup=6 prolog=change_prolog ngc=aaa epilog=change_epilog
 
 [EMCMOT]
 EMCMOT = motmod
diff --git a/configs/probe_basic/subroutines/aaa.ngc b/configs/probe_basic/subroutines/aaa.ngc
new file mode 100644
index 0000000..b991ea9
--- /dev/null
+++ b/configs/probe_basic/subroutines/aaa.ngc
@@ -0,0 +1,184 @@
+o<aaa> sub
+(DEBUG, from tool_in_spindle=#<tool_in_spindle> to selected_tool=#<selected_tool>)
+
+; -------------------------------------
+; --- Begin Initial data gathering ----
+; -------------------------------------
+
+#<fast_probe_fr> = #3004    (set from probe screen fast probe feed rate)
+#<slow_probe_fr> = #3005    (set from probe screen slow probe feedrate)
+#<traverse_fr> = #3006    (set from probe screen traverse probe feedrate)
+#<z_max_travel> = #3007    (max z distance the tool travels before erroring out if not contact is made)
+#<xy_max_travel> = #3008    (max xy distance the tool travels before erroring out if not contact is made)
+#<retract_distance> = #3009    (distance the tool retracts after making contact during fast feed mode)
+#<spindle_zero_height> = #3010    (G53 distance from home to spindle nose triggering point on touch plate)
+#<tool_diameter_probe_mode> = #3011    (activates the tool diameter probe subroutine section)
+#<tool_diameter_offset_mode> = #3012    (activates the tool diameter offset position for probe subroutine section)
+#<tool_setter_offset_direction> = #3013    (sets tool setter offset direction to move tool)
+#<tool_diameter> = #5410    (current tool's diameter used for offseting probe position in x axis)
+
+G92.1    (Cancel G92 offset)
+M50 P0
+
+#<tool_touch_x_coords> = #5181
+#<tool_touch_y_coords> = #5182
+#<tool_touch_z_coords> = #5183
+
+#<tool_change_x_coords> = 1
+#<tool_change_y_coords> = -16
+#<tool_change_z_coords> = 0
+
+
+#<tool_radius_offset> = [#<tool_diameter> / 2]
+#<left_offset_probing_position> = [#<tool_touch_x_coords> - #<tool_radius_offset>]
+#<right_offset_probing_position> = [#<tool_touch_x_coords> + #<tool_radius_offset>]
+#<front_offset_probing_position> = [#<tool_touch_y_coords> - #<tool_radius_offset>]
+#<back_offset_probing_position> = [#<tool_touch_y_coords> + #<tool_radius_offset>]
+
+#<tool> = #<selected_tool>
+#<pocket> = #<selected_pocket>
+#<local_start_x> = #<_x>
+#<local_start_y> = #<_y>
+#<local_start_z> = #<_z>
+
+#<zworkoffset> = [#[5203 + #5220 * 20] + #5213 * #5210]
+;#<offset_z> = #5422         ;Stores the offset of the current Z coordinate.
+
+o100 if [#<tool_diameter_offset_mode> EQ 1]
+    o101 if [#<tool_setter_offset_direction> EQ 0]
+        #<tool_touch_x_coords> = #<left_offset_probing_position>
+    o101 else if [#<tool_setter_offset_direction> EQ 1]
+        #<tool_touch_x_coords> = #<right_offset_probing_position>
+    o101 else if [#<tool_setter_offset_direction> EQ 2]
+        #<tool_touch_y_coords> = #<front_offset_probing_position>
+    o101 else if [#<tool_setter_offset_direction> EQ 3]
+        #<tool_touch_y_coords> = #<back_offset_probing_position>
+    o101 endif
+o100 endif
+
+; -------------------------------------
+; --- End Initial Data Gathering ----
+; -------------------------------------
+
+; -------------------------------------
+; --- Begin Initial Safety Checks ----
+; -------------------------------------
+
+; we must execute this only in the milltask interpreter
+; or preview will break, so test for '#<_task>' which is 1 for 
+; the milltask interpreter and 0 in the UI's
+o110 if [#<_task> EQ 0]
+        (debug, Task is Null)
+o110     return [999]
+o110 endif
+
+; check we are in right mode
+o120 if [#<_metric_machine>]
+    o125 if [#<_imperial>]
+       (MSG, Auto Tool probe error: not in G21 mode )
+    o125 return [-3] ; indicate probe contact failure to epilog
+    o125 endif
+o120 else
+    o125 if [#<_imperial> EQ 0]
+       (MSG, Auto Tool probe error: not in G20 mode )
+    o125 return [-3] ; indicate probe contact failure to epilog
+    o125 endif
+o120 endif
+
+; -------------------------------------
+; --- End Initial Safety Checks ----
+; -------------------------------------
+
+; -------------------------------------
+; --- Begin Physical Tool Change ----
+; -------------------------------------
+
+G90    (set absolute coordinates)
+G53 G0 F[#<traverse_fr>] Z0    (move to z0 home position)
+
+o200 if [#<_current_tool>  NE #<tool>]
+    ; then move to change position
+    G53 G0 F[#<traverse_fr>] X#<tool_change_x_coords> Y#<tool_change_y_coords>
+    G53 G0 F[#<traverse_fr>] Z#<tool_change_z_coords>
+o200 endif
+
+;cancel tool offset mode
+G49
+
+; using the code being remapped here means 'use builtin behaviour'
+;  ie, this is not a recursive call to this program, but calls the 
+;    un-remapped M6 processing 
+;  That processing includes actually sending the window to the user
+;    to press OK when they have completed the tool change.
+M6
+
+; -------------------------------------
+; ------ End Physical Tool Change ----
+; -------------------------------------
+
+; -------------------------------------
+; ------ Begin Safety Checks for Tool Offset Measurement ----
+; -------------------------------------
+
+
+; -------------------------------------
+; ------ Begin Tool Offset Measurement ----
+; -------------------------------------
+
+G90    (set absolute coordinates)
+G53 G1 F[#<traverse_fr>] Z0    (move to z0 home position)
+G53 G1 F[#<traverse_fr>] X#<tool_touch_x_coords> Y#<tool_touch_y_coords>
+G53 G1 F[#<traverse_fr>] Z#<tool_touch_z_coords>
+
+#<offset_z> = #5422         ;Stores the offset of the current Z coordinate.
+
+;switch to relative distance mode for probe moves
+G91
+
+F #<fast_probe_fr>
+G38.2 Z-[#<z_max_travel>]    (fast tool probe)
+#<z_fast_probe> = #5063    (save probe result of fast probe to parameters)
+G1 F[#<traverse_fr>] Z[#<retract_distance>]    (retract tool retract distance amount)
+
+o400 if [#5070 EQ 0]
+    G90
+o400 return [-3] ; indicate probe contact failure to epilog
+o400 endif
+
+(Slow Probe Rule, if Slow Probe FR is set to 0, Slow Probe is Bypassed)
+o410 if [#<slow_probe_fr> GT 0]
+    (Initiate Slow Z- Probe)
+    G91
+    F[#<slow_probe_fr>]    (set probe slow feedrate)
+    G38.2 Z-[#<retract_distance> * 2]    (slow tool probe)
+    #<z_slow_probe> = #5063
+o410 endif
+
+o420 if [#5070 EQ 0]
+    G90
+o420 return [-3] ; indicate probe contact failure to epilog
+o420 endif
+
+(Tool Diameter Probe Mode Section, User must define this section as needed)
+o430 if [#<tool_diameter_probe_mode> EQ 1]
+    (DEBUG, Tool Diameter Probing is Not Defined in Subroutine)
+o430 endif
+
+
+
+G90    (set absolute coordinates)
+G53 G1 F[#<traverse_fr>] Z0 (Send Spindle to home zero position)
+
+(define new tool length offset parameters)
+#<new_tool_length_offset> = [ABS[#<spindle_zero_height> + #5063 - #<offset_z>]]
+
+G10 L1 P #<tool> Z [#<new_tool_length_offset>]
+
+T #<tool> G43  H #<tool>    (enable tool length offset)
+
+M50 P1  (reinstate feedrate override)
+(DEBUG, new tool lenght offset: #<new_tool_length_offset>)
+(DEBUG, offset_z: #<offset_z>, spindle zero offset: #<spindle_zero_height>, fast probe: #<z_fast_probe>, slow probe: #<z_slow_probe>)
+
+o<aaa> endsub [1]
+M2
\ No newline at end of file