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Exactly. What I was meaning (sorry, my English isn't very good) is that the "simplification" made by your tool can enable similar gain in compression ratio with other similar tools. For example (using one of the posted sample):
WAV FLAC TAK RAR
01_41_30sec_lossy 5.168KB 1.957KB 2.119KB 2.755KB
02_41_30sec 5.168KB 3.473KB 3.284KB 3.633KB
Maybe two hours from now a new Lossless compressor will surface that enjoy an even higher gain than FLAC. In the end, I don't see the link between a generic tool that "simplify" a sound file, and a particular encoder (for witch the action of the tool may result especially beneficial).
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For optimum performance the intenal frame size of the encoder has to be taken into account when using the preprocessor. I suppose you haven't done this for TAK?
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I was curious...
I dowloaded "01_41_30sec_lossy" from here. Then i compressed it with TAK's default frame size and then with a frame size of 4096 Bytes. Results:
FLAC 2,004,157 Bytes
TAK Normal Default 2,023,188 Bytes
TAK Normal 4096 1,809,281 Bytes
TAK Turbo 4096 1,846,469 Bytes