Tools for time-stretching your sample loops without altering their pitch.
Below the fold: Time-Stretch sample loops calculator; and a Transposing, Time-stretching and Tempo Calculator.
Alternatively, you can transpose them without changing their tempo using either semi-tone or note-name values.
You don't need Acid to time-stretch those samples anymore!
Time-Stretching sample loops
To increase the beats per minute (bpm) of your sample, you must reduce its length (time-stretch less than 100%).
To decrease the bpm, we increase its length (time-stretch more than 100%).
For decimal values of bpm, use a decimal point (e.g., 98.678).
Transpose - Keep Tempo
Another time-stretch classic, but this time for transposing a loop.
When you pitch-shift a loop of say, 2 semitones, you raise it's bpm (thereby decrease it's length to play faster) proportionally.
If you don't want the bpm to change, you first have to "lengthen" the loop, then apply the transposition.
You can enter negative and decimal values of semitones. Use a decimal point to enter decimal values of semitones.
Transposing, Time-stretching and Tempo Calculator:
The same calculator as above, but instead of entering semitones, you can use named notes like "A2", "Db4", C3 etc... instead.