Index: dialin/ui/hd_simulator.py
===================================================================
diff -u -re55ac65c47c243e4a942688ff9c94805a9cea76b -r2a98d3c2f9b7cc7ef136729725ba3d83249230ae
--- dialin/ui/hd_simulator.py	(.../hd_simulator.py)	(revision e55ac65c47c243e4a942688ff9c94805a9cea76b)
+++ dialin/ui/hd_simulator.py	(.../hd_simulator.py)	(revision 2a98d3c2f9b7cc7ef136729725ba3d83249230ae)
@@ -24,9 +24,9 @@
 from threading import Semaphore
 from random import random
 from copy import deepcopy
+from math import copysign
 import threading as threads_here
 from time import time, sleep
-
 def catch_exception(f):
     @functools.wraps(f)
     def func(*args, **kwargs):
@@ -297,8 +297,10 @@
                     self.demoCountdownId = self.pause_demoId
                     self.demoCount = self.pause_demoCount
                     self.demoCounter = self.demoCount - 1
+                    if self.demoSelection == 42:  # Rinseback in process; short cycle it
+                        self.rinseback_volume_out_ml = self.rinseback_volume_set_ml - 1
+                        self.rinseback_volume_all_ml = self.rinseback_volume_out_ml
 
-
             # INITIATE A NEW TREATMENT SETUP ----------------------------------
             elif msg_id == MsgIds.MSG_ID_UI_INITIATE_TREATMENT_REQUEST.value:
                 rsp_id = MsgIds.MSG_ID_HD_OP_MODE
@@ -337,6 +339,8 @@
                                                 +  self.demo_treatment_params.data_int[TreatmentParameters.TREATMENT_PARAM_ARTERIAL_PRESSURE_HIGH_LIMIT_MMHG.value]) / 2
                 self.venous_pressure_mid_mmHg = (self.demo_treatment_params.data_int[TreatmentParameters.TREATMENT_PARAM_VENOUS_PRESSURE_LOW_LIMIT_MMHG.value]
                                               +  self.demo_treatment_params.data_int[TreatmentParameters.TREATMENT_PARAM_VENOUS_PRESSURE_HIGH_LIMIT_MMHG.value]) / 2
+                self.arterial_pressure_mmHg = self.arterial_pressure_mid_mmHg - 32.0 # simulation
+                self.venous_pressure_mmHg = self.venous_pressure_mid_mmHg + 32  # simulation
                 # Rinseback
                 self.rinseback_volume_set_ml = 80 + 120   # TBD! 80 + should be based on dialyzer blood volume?
                 self.rinsebackVelocity_ml_per_sec = params.data_int[TreatmentParameters.TREATMENT_PARAM_RINSEBACK_FLOW_RATE_ML_MIN.value] / 60.0
@@ -915,11 +919,12 @@
 
                 # MSG_ID_PRESSURE_OCCLUSION_DATA  ## TBD! combine with Treatment update data
                 self.arterial_pressure_mmHg += (random() - 0.5) * 10  # TBD! replace magic wander numbers
-                if self.arterial_pressure_mmHg > (self.arterial_pressure_mid_mmHg + 30):
-                    self.arterial_pressure_mmHg -= 5
-                self.venous_pressure_mmHg += (random() - 0.5) * 10
-                if self.venous_pressure_mmHg > (self.venous_pressure_mid_mmHg + 30):
-                    self.venous_pressure_mmHg -= 5
+                delta = self.arterial_pressure_mmHg - self.arterial_pressure_mid_mmHg
+                if abs(delta) > 30:
+                    self.arterial_pressure_mmHg -= copysign(5, delta)
+                delta = self.venous_pressure_mmHg - self.venous_pressure_mid_mmHg
+                if abs(delta) > 30:
+                    self.venous_pressure_mmHg -= copysign(5, delta)
                 self.cmd_set_pressure_occlusion_data(arterial_prs=self.arterial_pressure_mmHg,
                                                      venous_prs=self.venous_pressure_mmHg,
                                                      blood_pump_occlusion=0,