Here's whatsnew:
-Lowpass filter may be triggered in menu and in .ini-file
-Gigascreen mode (eff7 bit 4) changed to turbo mode off, as in real Pentagon 1024SL 2.x (key W in Mr Gluk Reset Service).
-Turbo off sets 71680 ticks per frame.
-The sound is re-initialized when this bit switched (bit 3)
-Read only cache (eff7 bit 3) changed to "RAM0 in 0000-3fff" mode, as in real Pentagon 1024SL 2.x
-FM volume slightly fixed
-Half of GS right channel is mixed to the left channel and vice versa
-Reduced volume clicks in GS

Get it here:
http://alonecoder.narod.ru/zx

-Trebor