LinPlug CrX4 - Manual (Page 59)

The “Allow Host Program Change” is similar, but allows or suppresses the
host to change a program (patch) in CrX4. The default is again On.
Auto Close on Program Select is usually On and means that when you
selected a patch in the Patch Select window, that the window automatically
closes (and thus returns to the normal Edit Window). You may switch this
Off in case you want to try multiple presets successively.
The Wider OSC FM Range either switches the new CrX4 FM (Frequency
Modulation) range of the generators On (more sonic possibilities) or Off
(compatibility with CronoX 3 and CronoX 2 patches).
There is a further compatibility option: “CronoX 2 Sound compatibility”,
which allows the CrX4 to have the characteristic harsh sound of the
CronoX 2 oscillators and filters (among a few other smaller adjustments to
make the sound compatible).
This option is automatically set when you load a CronoX 2 preset.
CrX4 User Manual 59