root@BeagleBone:/home/debian# arecord -c 8 -r 128 -f S32 -t raw AD7771_rec1.raw
Recording raw data 'AD7771_rec1.raw' : Signed 32 bit Little Endian, Rate 128000 Hz, Channels 8
^CAborted by signal Interrupt...
root@BeagleBone:/home/debian# xxd -e AD7771_rec1.raw
00000000: 00000000 00000000 00000000 00000000  ................
00000010: 00000000 00000000 00000000 00000000  ................
00000020: a47a0000 bafb0000 dbfc0000 f3fe0000  ..z.............
00000030: b1fb0000 c93b0000 e7fd0000 fcff0000  ......;.........
00000040: 877f0000 a67f0000 cbfe0000 ed7e0000  ..............~.
00000050: 9a800000 b4ff0000 dafe0000 fc800000  ................
00000060: 86fd0000 a8be0000 c7ff0000 e8bd0000  ................
00000070: 9c3f0000 b33f0000 d53e0000 f9fe0000  ..?...?...>.....
00000080: 80ff0000 a8000000 c7ff0000 e1ff0000  ................
00000090: 9a010000 b4000000 d2ff0000 f1000000  ................
000000a0: 83400000 ae000000 c7ff0000 e5c00000  ..@.............
000000b0: 9e800000 ba000000 d2ff0000 f5800000  ................
000000c0: 87010000 aa7c0000 c97f0000 e47e0000  ......|.......~.
000000d0: 9efe0000 bd7f0000 d9820000 fa800000  ................
000000e0: 8a3f0000 a6010000 caff0000 e2800000  ..?.............
000000f0: 9dff0000 be3e0000 dfbe0000 fcfd0000  ......>.........
00000100: 8afc0000 a8ff0000 cafd0000 e3ff0000  ................
00000110: 9dfb0000 bbfe0000 defb0000 f9fd0000  ................
00000120: 837b0000 a8ff0000 c73c0000 e27e0000  ..{.......<...~.
00000130: 967b0000 ba7e0000 d83b0000 f6fd0000  ..{...~...;.....
00000140: 82000000 a97f0000 c67f0000 e1ff0000  ................
00000150: 96820000 bd010000 d8000000 f8000000  ................
00000160: 84c30000 a8bd0000 c5bd0000 e2c10000  ................
00000170: 977c0000 bf3d0000 d9be0000 f83b0000  ..|...=.......;.
00000180: 89fe0000 a4ff0000 c2000000 e5010000  ................
00000190: 93010000 bcfb0000 d9020000 f3000000  ................
000001a0: 893f0000 a4ff0000 c4400000 e7410000  [email protected].
000001b0: 95410000 b87b0000 dd820000 f4800000  ..A...{.........
000001c0: 8a010000 a5800000 ca050000 e9000000  ................
000001d0: 9a050000 b9820000 d7f50000 f7820000  ................
000001e0: 893a0000 a5ff0000 cb340000 eb010000  ..:.......4.....
000001f0: 9bfa0000 b9f90000 d2830000 fa3f0000  ..............?.
00000200: 83ff0000 a6030000 c00a0000 edf90000  ................
00000210: 95ff0000 b4000000 d7050000 faf90000  ................
00000220: 83ff0000 aa840000 ca8b0000 e8ba0000  ................
00000230: 953e0000 b5800000 dc440000 f4f80000  ..>.......D.....
00000240: 85820000 ab7e0000 cf010000 e9030000  ......~.........
00000250: 93fd0000 b7810000 d9f80000 f6040000  ................
00000260: 87810000 aa7d0000 ccf40000 ec440000  ......}.......D.
00000270: 93000000 b7fb0000 d5ff0000 fa020000  ................
00000280: 88fb0000 a9000000 c3ff0000 eff70000  ................
00000290: 930a0000 b4fb0000 d6080000 fcf40000  ................
000002a0: 85fb0000 aa810000 c3ff0000 e9f70000  ................
000002b0: 9b4a0000 b1fb0000 dd880000 f3f30000  ..J.............
000002c0: 87840000 aaff0000 c5820000 e4780000  ..............x.
000002d0: 9dff0000 b68a0000 df7d0000 f0ff0000  ..........}.....
000002e0: 88fb0000 a9370000 c7400000 e2450000  [email protected].
000002f0: 9e400000 bc810000 debd0000 f3480000  [email protected].
00000300: 86050000 a3fd0000 c7ff0000 e6000000  ................
00000310: 9ef10000 bdfd0000 ddf30000 f9fc0000  ................
00000320: 89c50000 a33e0000 c7ff0000 e6c00000  ......>.........
00000330: 95300000 bd3d0000 d6730000 f87c0000  ..0...=...s...|.
00000340: 88780000 a4830000 cb060000 e7810000  ..x.............