S550 - S330

Suppose we have a waveform of length x, we divide it into
attack (A), peak (P), initial decay level (D), and sustain
level (S), it's amplitude display on a sampler's screen
would look something like this:

Amplitude

|
| /W\\\
|{{[[]]}}}}))))>>>>~~~~~ ~ ~ ~
| \W///
|--------------------x-------------------> Time
(A)(P) (D) (S) (M) (R)

So this is what you do to work out a loop for the section S -R

1) Note down the positions of points S and R

2) Extract S-R. So you now have two samples: A-P-D and S-R.
3) Make an exact copy of S-R but IN REVERSE !!! So now you have
a new sample R-S, too.

4) Use the 'MIX' function to combine the samples S-R. and R-S but
using half (50%) amplitude for each one, so that the sum would
not exceed the original amplitude.

5) So now you have a sample that is geometrically balanced at the
exact middle point M = (S+R)/2. Listen to it.

6) If you are unlucky you will hear a lot of phasing out and you
have to choose a different set of points for S and R, and do
it again. Otherwise you should notice a consistent sound.

7) Choose a point between S and the middle point M where you wish
your loop to begin, set this to be loop start L. Set the point
exact distance away from M on the other side as loop end E:

S---L----------M----------E---R

i.e. (M-L) = (E-M) = E = 2M - L = E = S - L

In simple English, the loop start L is as far away from origin
S as the end point E is away from R. Work it out yourself.

So now you should have a perfectly geometrical loop L-E.

8) Stick the sample A-P-D and S-L-M-E-R together again. Viola !
Now you have a loop !