diff --git a/4410-4412.tex b/4410-4412.tex
index 95ff36e..405bd50 100644
--- a/4410-4412.tex
+++ b/4410-4412.tex
@@ -821,16 +821,16 @@ In the following example, the amplitude of DDS is proportional to the ADC input
 First, initialize the RTIO, SU-Servo and its channel.
 Note that the programmable gain of the Sampler is $10^0=1$, the input range is [-10V, 10V].
 
-\inputcolorboxminted{firstline=14,lastline=21}{examples/suservo.py}
+\inputcolorboxminted{firstline=12,lastline=19}{examples/suservo.py}
 
 Next, setup the PI control as an IIR filter. It has -1 proportional gain $k_p$ and no integrator gain $k_i$.
 
-\inputcolorboxminted{firstline=22,lastline=29}{examples/suservo.py}
+\inputcolorboxminted{firstline=20,lastline=27}{examples/suservo.py}
 
 Then, configure the DDS frequency to 10 MHz with 3V input offset.
 When input voltage $\geq$ offset voltage, the DDS output amplitude is 0.
 
-\inputcolorboxminted{firstline=30,lastline=34}{examples/suservo.py}
+\inputcolorboxminted{firstline=28,lastline=32}{examples/suservo.py}
 
 SU-Servo encodes the ADC voltage in a linear scale [-1, 1].
 Therefore, 3V is converted to 0.3.
@@ -838,7 +838,7 @@ Note that the ASF of all DDS channels are capped at 1.0, the amplitude clips whe
 
 Finally, enable the SU-Servo channel with the IIR filter programmed beforehand.
 
-\inputcolorboxminted{firstline=36,lastline=37}{examples/suservo.py}
+\inputcolorboxminted{firstline=34,lastline=35}{examples/suservo.py}
 
 A 10 MHz DDS signal is generated from the example above, with amplitude controllable by ADC.
 The RMS voltage of the DDS channel against the ADC voltage is plotted.
diff --git a/examples/suservo.py b/examples/suservo.py
index 6b028bb..f700fab 100644
--- a/examples/suservo.py
+++ b/examples/suservo.py
@@ -7,9 +7,7 @@ class SUServoExample(EnvExperiment):
     def build(self):
         self.setattr_device("core")
         self.suservo = self.get_device("suservo0")
-        self.suschannels = [
-            self.get_device("suservo0_ch0")
-        ]
+        self.suschannel0 = self.get_device("suservo0_ch0")
 
     @kernel
     def run(self):
@@ -18,8 +16,8 @@ class SUServoExample(EnvExperiment):
         self.suservo.init()
         self.suservo.set_pgia_mu(0, 0)  # unity gain
         self.suservo.cplds[0].set_att(0, 15.)
-        self.suschannels[0].set_y(profile=0, y=0.) # Clear integrator
-        self.suschannels[0].set_iir(
+        self.suschannel0.set_y(profile=0, y=0.) # Clear integrator
+        self.suschannel0.set_iir(
             profile=0,
             adc=0,          # take data from Sampler channel 0
             kp=-1.,         # -1 P gain
@@ -27,11 +25,11 @@ class SUServoExample(EnvExperiment):
             g=0.,           # no integrator gain limit
             delay=0.        # no IIR update delay after enabling
         )
-        self.suschannels[0].set_dds(
+        self.suschannel0.set_dds(
             profile=0,
             offset=-.3,     # 3 V with above PGIA settings
             frequency=10*MHz,
             phase=0.)
         # enable RF, IIR updates and set profile
-        self.suschannels[0].set(en_out=1, en_iir=1, profile=0)
+        self.suschannel0.set(en_out=1, en_iir=1, profile=0)
         self.suservo.set_config(enable=1)