Public bug reported:

Binary package hint: sox

On Jaunty:

# time sox test.wav test.out.wav speed 0.68

real    0m1.428s
user    0m1.270s
sys     0m0.040s

On Karmic:

time sox test.wav test.out.wav speed 0.68

real    0m37.683s
user    1m13.900s
sys     0m0.370s

$ wavinfo test.wav 
Header info for: test.wav
WaveHeader Size:        12
ChunkHeader Size:       8
FormatChunk Size:       16
RIFF ID:        RIFF
Total Size:     2147479588
Wave ID:        WAVE
Chunk ID:       fmt 
Chunk Size:     16
Compression format is of type: 1
Channels:       2
Sample Rate:    48000
Bytes / Sec:    192000
wBlockAlign:    4
Bits Per Sample Point:  16
Warning: Real file size is 7880704, but wave header says it should be 
2147479552. Using real file size instead.
wavDataPtr: 44
wavDataSize: 7880660

** Affects: sox (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Sox up to 100x slower in Karmic than in Jaunty
https://bugs.launchpad.net/bugs/446184
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