Last year I posted an explanation. I’ve copied it below in slightly edited form. The example I gave increased the dynamic range more than 6db but the procedure remains the same. Here it is:
Here’s how to modify the dynamic range of the EXP instruments using the Instrument Editor. Because the dynamic range curves in GigaStudio do not apply to this type of instrument it is necessary to modify the actual level of the sample layers to achieve wider dynamic range. Here\'s an example of how to do it:
1. Open the Instrument Editor and load \"1st Violins Long Bows 1.gig\" into the Editor.
2. In the instrument list on the left, highlight instrument #2 (1st Vln SusV EXP).
3. \"Rubberband\" all regions (G3 to C7, below the keyboard graphic) by placing your cursor to the left of the regions, click and hold the left mouse button, draw your cursor to the right across all of the regions, and release the mouse button. If you have done this correctly all regions should turn yellow.
4. In the middle of the screen is the \"layer\" area. There are 4 segments under the word \"layer.\" Place your cursor in the far left segment and left click. This is the \"p\" layer. The left segment (only) should be green.
5. On the far right of the region area there is a calibration fader. Pull it all the way down. This will display the maximum available dynamic range.
6. Locate the left drop-down menu above the keyboard graphic, click on it and choose \"attenuation\" from the menu list. The left menu bar should now say \"attenuation.\"
7. Carefully place your cursor over the first region\'s attenuation indicator (blue ball) and left click. This is important: All regions should remain yellow during this operation. If the region you click becomes the only yellow region, go back and rubberband all regions again. Click and hold the left mouse button and move the \"blue ball\" upward (all \"blue balls\" - if you\'ll pardon the expression - should move together, even though you are only moving one of them). Notice that as you hold the mouse button a number appears at the cursor position. This is the amount of attenuation in decibels. As a beginning experiment, move the cursor up until the number reads around \"30.\" You will probably need to choose a close fraction. This will attenuate the softest layer by approximately 30db.
8. Place your cursor over the next \"layer\" segment (second from the left) and click. The second segment (only) should turn green. Follow the same procedure to increase the attenuation value to around \"20.\" This will attenuate the \"mp\" layer by approximately 20db.
9. Place your cursor over the 3rd \"layer segment (second from the right) and click. The third segment only should turn green. Follow the same procedure to increase the attenuation value to around \"10.\" This will attenuate the \"mf\" layer by approximately 10db.
10. It is unnecessary to modify the final \"f\" layer.