That is what Ketron on their homepage is listing for 4.2a
NEW UPDATE 4.2a
1.Remarkable Improvement on Midi Clock send external Sync.
2.The present Play List is now annulled as soon a .mid, .wav or .mp3 is saved.
3.Whenever a Single or Block Registration is loaded, a Program Change is sent.
4.From this version on it will be no longer necessary to manually deactivate the Mp3 Transposer to avoid that while changing the Tempo of the Style being executed the pitch is modified. From now on the instrument does everything automatically.
5.During the Swell to Right the General Volume value that was active when this function was selected, remains in the memory.
6.The Footswitch was enriched with the following controls: Back/Forward Tab, Enter, File Up/Down, Sub Reg. Up/Down as well as all Tabs from F1 to F10.
7.New Reverb, Phaser and Flanger effects.
8.The Global Search now works correctly in the Registration area.
9.The User Audio Drums in the Registration can now be handled correctly.
10. For Vocalizer to Arranger the OFF value can be set.
11. The Expression Pedal curve was optimized.
12. In the Pattern Edit Menu the Quantize as well as the Pitch and
Modulation controls were improved.
13. The following functions were optimized: Registration, 2nd Voice, Separate
Outputs, Karaoke, Ins, Msp, Footswitch and many more.
14. The Audya 4 can be reset by pressing the Exit+User5/10 keys at the same
time.
If you go to the download page for the new version, there is on the left top "News", and there it is hidden.
Unfortunately it nothing says about the new bugs (which are probably also about 10)
Joe