Crack at Loop Point with Some .sf2 Files

Creating a soundfont may seem easy at first.
But if it is not formed correctly, the result may not be good.

in Polyphone:
1. First delete all loop start and end points in the "Instrument" section.
2. Instead, select the samples to be looped in the "Sample" section and select "automatic-loop" in the "sample" section of "Tools" in the Top menu (Tools-> Sample-> Auto Loop)
Note: You can select more than one sample in the Tree-View on the left side. (while holding down the Shift key) Flutes and Strings can be looped automatically in this way.

3. Delete all "Vol env attack" and "Vol env release" values ​​in the "Preset" section.
-
4. Now enter new values:

In the "Instrument" section:
Values ​​to be entered into the "Global" column of each instrument:

for "Vol env attack (s)": 0.003 // This value is required for FluidSynth.
for "Vol env release (s)": 0.6 // The last part of some samples is cut off. Some release effect is required.

In the "Preset" section:
Values ​​to be entered in the "Global" column of each preset:

Harp, Guitar 1 (Hold), Guitar 2 (Hold):
for "Vol env release": 10
// (0.6 * 10 = 6 seconds)

Slow Strings, Slow Flute,
for "Vol env attack": 100
// (0.003 * 100 = 0.3 seconds)

For result, see attachment (There are no crack sounds anymore.):
This "ogg" file is directly exported from MuseScore.
Note: There is rests on start and middle. Flute started playing on 16th and 48th seconds.

Rain_in_the_Forest-Flute-new.ogg

Full file:
Rain_in_the_Forest.ogg

No crackling sounds after all.