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diff --git a/Lib/sunos5/SUNAUDIODEV.py b/Lib/sunos5/SUNAUDIODEV.py
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+# Symbolic constants for use with sunaudiodev module
+# The names are the same as in audioio.h with the leading AUDIO_
+# removed.
+
+# Not all values are supported on all releases of SunOS.
+
+# Encoding types, for fields i_encoding and o_encoding
+
+ENCODING_NONE = 0 # no encoding assigned
+ENCODING_ULAW = 1 # u-law encoding
+ENCODING_ALAW = 2 # A-law encoding
+ENCODING_LINEAR = 3 # Linear PCM encoding
+
+# Gain ranges for i_gain, o_gain and monitor_gain
+
+MIN_GAIN = 0 # minimum gain value
+MAX_GAIN = 255 # maximum gain value
+
+# Balance values for i_balance and o_balance
+
+LEFT_BALANCE = 0 # left channel only
+MID_BALANCE = 32 # equal left/right channel
+RIGHT_BALANCE = 64 # right channel only
+BALANCE_SHIFT = 3
+
+# Port names for i_port and o_port
+
+PORT_A = 1
+PORT_B = 2
+PORT_C = 3
+PORT_D = 4
+
+SPEAKER = 0x01 # output to built-in speaker
+HEADPHONE = 0x02 # output to headphone jack
+LINE_OUT = 0x04 # output to line out
+
+MICROPHONE = 0x01 # input from microphone
+LINE_IN = 0x02 # input from line in