About This File
The XW-P1 seems to have plenty of PCM tones that emulate the sound of a string section of an orchestra but they evidently are all based on a single set of samples. The resulting sound is somewhat strident. While that fits well with some types of music it doesn't fit well with others. This is an attempt to create a more lush, "Hollywood" kind of string sound. The result is far from perfect - the XW-P1 just doesn't have the required samples - but it is somewhat better than the default string-section sounds.
Note that when the tone is first called up, it is necessary to jog the modulation wheel in order to hear the tone at its proper volume. The modulation wheel is used here as a real-time expression control much like how sample libraries use it rather than for vibrato.
Note that the softer string-section sound is accessed with velocities from 000 to 090. A slightly more marcato sound is triggered with velocities from 091 to 110, and the P1's "standard" string-section sound with a marcato attack is triggered above velocity 110. If your playing style differs from mine, you might have to customize those velocities.
PS. I initially uploaded a version of the file with wrong velocities. I am not sure I successfully corrected that so be sure to compare what is in the file with the velocity ranges described above, which should also match those listed in The XW-P1 Companion: Volume 2 - Emulation Examples, where you can also read about how the tone was crafted.