diff --git a/fast-servo/pyfastservo/loopback.py b/fast-servo/pyfastservo/loopback.py
index 13ee77b..ff0b685 100644
--- a/fast-servo/pyfastservo/loopback.py
+++ b/fast-servo/pyfastservo/loopback.py
@@ -1,48 +1,60 @@
 import time
 from pyfastservo import adc, dac
 from pyfastservo.common import (
-    ADC_CH1_HIGH_ADDR,
-    ADC_CH1_LOW_ADDR,
-    CH1_HIGH_WORD_ADDR,
-    CH1_LOW_WORD_ADDR,
-    read_from_memory,
-    write_to_memory
+    ADC_CH0_HIGH_ADDR, ADC_CH0_LOW_ADDR,
+    ADC_CH1_HIGH_ADDR, ADC_CH1_LOW_ADDR,
+    CH0_HIGH_WORD_ADDR, CH0_LOW_WORD_ADDR,
+    CH1_HIGH_WORD_ADDR, CH1_LOW_WORD_ADDR,
+    read_from_memory, write_to_memory
 )
 
-def read_adc():
-    adc_value = adc.read_adc_channel(ADC_CH1_HIGH_ADDR, ADC_CH1_LOW_ADDR)
-    return adc_value
+def read_adc(channel):
+    if channel == 0:
+        return adc.read_adc_channel(ADC_CH0_HIGH_ADDR, ADC_CH0_LOW_ADDR)
+    elif channel == 1:
+        return adc.read_adc_channel(ADC_CH1_HIGH_ADDR, ADC_CH1_LOW_ADDR)
+    else:
+        raise ValueError("Invalid ADC channel")
 
-def write_dac(value):
-    dac.set_dac_output(value)
+def write_dac(channel, value):
+    dac.set_dac_output(value, channel)
 
-def read_dac():
-    high_word = read_from_memory(CH1_HIGH_WORD_ADDR, 1)[0]
-    low_word = read_from_memory(CH1_LOW_WORD_ADDR, 1)[0]
+def read_dac(channel):
+    if channel == 0:
+        high_word = read_from_memory(CH0_HIGH_WORD_ADDR, 1)[0]
+        low_word = read_from_memory(CH0_LOW_WORD_ADDR, 1)[0]
+    elif channel == 1:
+        high_word = read_from_memory(CH1_HIGH_WORD_ADDR, 1)[0]
+        low_word = read_from_memory(CH1_LOW_WORD_ADDR, 1)[0]
+    else:
+        raise ValueError("Invalid DAC channel")
     return (high_word << 8) | low_word
 
-def perform_loopback_test(test_value):
-    print(f"Setting DAC output to {test_value}...")
-    write_dac(test_value)
+def perform_loopback_test(channel, test_value):
+    print(f"\nTesting Channel {channel}")
+    print(f"Setting DAC CH{channel} output to {test_value}...")
+    write_dac(channel, test_value)
     time.sleep(0.1)  # Allow time for the signal to stabilize
 
-    print("Reading ADC value...")
-    adc_value = read_adc()
-    print(f"ADC readback: {adc_value}")
+    print(f"Reading ADC CH{channel} value...")
+    adc_value = read_adc(channel)
+    print(f"ADC CH{channel} readback: {adc_value}")
 
-    print("Reading DAC value...")
-    dac_value = read_dac()
-    print(f"DAC readback: {dac_value}")
+    print(f"Reading DAC CH{channel} value...")
+    dac_value = read_dac(channel)
+    print(f"DAC CH{channel} readback: {dac_value}")
 
     if abs(test_value - adc_value) <= 2 and abs(test_value - dac_value) <= 2:
-        print("Loopback test PASSED!")
+        print(f"Loopback test for Channel {channel} PASSED!")
     else:
-        print("Loopback test FAILED!")
+        print(f"Loopback test for Channel {channel} FAILED!")
         print(f"Expected: {test_value}, ADC: {adc_value}, DAC: {dac_value}")
 
 def main():
-    test_value = 0x2000  # Mid-range value (8192 in decimal)
-    perform_loopback_test(test_value)
+    test_value = 0x0FFF  # Mid-range value (4095 in decimal)
+    
+    perform_loopback_test(0, test_value)
+    perform_loopback_test(1, test_value)
 
 if __name__ == "__main__":
     main()
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