diff --git a/scripts/amodem b/scripts/amodem
index 0ee4503..b988c8d 100755
--- a/scripts/amodem
+++ b/scripts/amodem
@@ -11,11 +11,12 @@ import logging
 format = '%(asctime)s %(levelname)-10s %(message)-100s %(filename)s:%(lineno)d'
 logging.basicConfig(level=logging.DEBUG, format=format)
 
-import amodem.recv
-import amodem.send
-import amodem.wave
+from amodem import recv
+from amodem import send
+from amodem import wave
 
 import argparse
+from functools import partial
 
 def FileType(mode, process=None):
     def opener(fname):
@@ -24,8 +25,8 @@ def FileType(mode, process=None):
             fname = '-'
 
         if fname is None:
-            if 'r' in mode: return process(stdout=amodem.wave.sp.PIPE).stdout
-            if 'w' in mode: return process(stdin=amodem.wave.sp.PIPE).stdin
+            if 'r' in mode: return process(stdout=wave.sp.PIPE).stdout
+            if 'w' in mode: return process(stdin=wave.sp.PIPE).stdin
 
         if fname == '-':
             if 'r' in mode: return _stdin
@@ -38,41 +39,70 @@ def FileType(mode, process=None):
 
 def main():
     p = argparse.ArgumentParser()
-    sub = p.add_subparsers()
+    subparsers = p.add_subparsers()
 
-    send = sub.add_parser('send')
-    send.add_argument('-i', '--input', help='input file (use "-" for stdin).')
-    send.add_argument('-o', '--output', help='output file (use "-" for stdout).'
+    # Modulator
+    sender = subparsers.add_parser('send', help='modulate binary data into audio signal.')
+    sender.add_argument('-i', '--input', help='input file (use "-" for stdin).')
+    sender.add_argument('-o', '--output', help='output file (use "-" for stdout).'
         ' if not specified, `aplay` tool will be used.')
 
-    send.add_argument('--silence-start', type=float, default=1.0,
+    sender.add_argument('--silence-start', type=float, default=1.0,
                       help='seconds of silence before transmission starts')
-    send.add_argument('--silence-stop', type=float, default=1.0,
+    sender.add_argument('--silence-stop', type=float, default=1.0,
                       help='seconds of silence after transmission stops')
 
-    send.set_defaults(main=amodem.send.main,
+    sender.set_defaults(main=send.main,
         input_type=FileType('rb'),
-        output_type=FileType('wb', amodem.wave.play)
+        output_type=FileType('wb', wave.play)
     )
 
-    recv = sub.add_parser('recv')
-    recv.add_argument('-i', '--input', help='input file (use "-" for stdin).'
+    # Demodulator
+    receiver = subparsers.add_parser('recv', help='demodulate audio signal into binary data.')
+    receiver.add_argument('-i', '--input', help='input file (use "-" for stdin).'
         ' if not specified, `arecord` tool will be used.')
-    recv.add_argument('-o', '--output', help='output file (use "-" for stdout).')
-    recv.add_argument('--skip', type=int, default=128,
+    receiver.add_argument('-o', '--output', help='output file (use "-" for stdout).')
+    receiver.add_argument('--skip', type=int, default=128,
                       help='skip initial N samples, due to spurious spikes')
-    recv.add_argument('--plot', dest='plt', action='store_true', default=False,
+    receiver.add_argument('--plot', dest='plt', action='store_true', default=False,
                       help='plot results using pylab module')
-    recv.set_defaults(main=amodem.recv.main,
-        input_type=FileType('rb', amodem.wave.record),
+    receiver.set_defaults(main=recv.main,
+        input_type=FileType('rb', wave.record),
         output_type=FileType('wb')
     )
 
+    # Audio recording tool
+    fmt = 'a raw audio file (16 bits at {:.1f} kHz)'.format(wave.Fs / 1e3)
+    recorder = subparsers.add_parser('record', help='record ' + fmt)
+    recorder.add_argument(
+        'filename', default='-',
+        help='path to the audio file to record (otherwise, use stdout)')
+    recorder.set_defaults(main=partial(run, process=wave.record))
+
+    # Audio playing tool
+    player = subparsers.add_parser('play', help='play ' + fmt)
+    player.add_argument(
+        'filename', default='-',
+        help='path to the audio file to play (otherwise, use stdin)')
+    player.set_defaults(main=partial(run, process=wave.play))
+
+    # Parsing and execution
     args = p.parse_args()
-    args.input = args.input_type(args.input)
-    args.output = args.output_type(args.output)
+    if hasattr(args, 'input_type'):
+        args.input = args.input_type(args.input)
+    if hasattr(args, 'output_type'):
+        args.output = args.output_type(args.output)
     args.main(args)
 
+def run(args, process):
+    p = process(fname=args.filename)
+    exitcode = 0
+    try:
+        exitcode = p.wait()
+    except KeyboardInterrupt:
+        p.kill()
+        exitcode = p.wait()
+    sys.exit(exitcode)
 
 if __name__ == '__main__':
     main()
diff --git a/scripts/audio b/scripts/audio
deleted file mode 100755
index d4e4a48..0000000
--- a/scripts/audio
+++ /dev/null
@@ -1,34 +0,0 @@
-#!/usr/bin/env python
-import logging
-logging.basicConfig(level=logging.DEBUG, format='%(message)s')
-
-from amodem import wave
-
-import argparse
-parser = argparse.ArgumentParser()
-subparsers = parser.add_subparsers()
-fmt = 'a raw audio file (16 bits at {:.1f} kHz)'.format(wave.Fs / 1e3)
-recorder = subparsers.add_parser('record', help='record ' + fmt)
-recorder.add_argument(
-    'filename', default='-',
-    help='path to the audio file to record (otherwise, use stdout)')
-recorder.set_defaults(func=wave.record)
-
-player = subparsers.add_parser('play', help='play ' + fmt)
-player.add_argument(
-    'filename', default='-',
-    help='path to the audio file to play (otherwise, use stdin)')
-player.set_defaults(func=wave.play)
-
-args = parser.parse_args()
-p = args.func(fname=args.filename)
-
-import sys
-exitcode = 0
-try:
-    exitcode = p.wait()
-except KeyboardInterrupt:
-    p.kill()
-    exitcode = p.wait()
-
-sys.exit(exitcode)