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Each key is assigned a keycode number from one to twelve, like hours around a clock. To select a compatible key from any origin keycode, choose a keycode within one number of your original keycode. THAT'S IT! If you are in keycode 9, you can select an 8, 9 or 10. If you are in keycode 4, you can select a 3, 4 or 5. If you are in keycode 12, you can select an 11, 12 or 1. Your best mixes will be into another song at the same speed and key. SIMPLE ENOUGH?

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The normal speed of the incoming song should be as close as possible to the speed of the original song. This is because changing the speed normally changes the pitch of music (exceptions include key stabilizer circuits such as Pioneer's "Master Tempo" and Denon's "Key Adjust"). You can sometimes get away with speed differences of up to 3%, but such mixes WILL tend to sound sour.

Do not confuse a 3% speed difference with a 3 BPM difference. They are the same ONLY when pitching up or down from 100 BPM. A 3% speed increase from 100 BPM is exactly 103 BPM. However, a 3% speed increase from 130 BPM is 133.9 BPM, not 133 BPM. A 3% speed increase from 80 BPM is 82.4 BPM, not 83 BPM. As a general rule, a difference of 2 BPM is acceptable for harmonic mixing below 100 BPM. A difference of 3 BPM is acceptable for harmonic mixing above 100 BPM. The longer your harmonic overlay, the more noticeable speed differences will be. Keep speed differences as small as possible.