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How To Make Sound Files Smaller?

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Hello, I am making a map and I am just wondering if there is there a possible way to make .wav files smaller so that they take up less space
 

Dr Super Good

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1. Reduce sample rate. Less samples per second mean linearly less data per second of sound.
2. Reduce resolution. Lower resolution means each sample takes less to store so more samples can be supported.
3. Lossy compression. Alter the way data is stored into a more compact form.
4. Compress. Compressing the data with various algerthims can reduce file size depending on the way the data is stored.

1,2 and 3 all will reduce the quality of the reproduced sound when played back (will sound less like orignal).
4. Will not alter sound quality at all but will provide the least gain in space. Most lossy compressions do this extensivly as well so compressing a .mp3 will yield virtually no size decrease.
 
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